Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 9 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Dec. 31, 2014 |
Jan. 31, 2014 |
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| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||||
| Balance (in shares) | 39,147,153 | |||||||||
| Balance | $ 1,109,489 | $ 841,392 | ||||||||
| Net earnings | $ 30,308 | $ 32,577 | 75,841 | 93,033 | ||||||
| Exercise/vesting of equity awards, value | 2,881 | 734 | ||||||||
| Excess income tax benefit from stock-based awards | 2,040 | 2,197 | ||||||||
| Equity award compensation expense | $ 12,418 | 9,035 | ||||||||
| Issuance of stock, value | [1] | 110,420 | ||||||||
| Other | (114) | |||||||||
| Balance (in shares) | 39,665,797 | 39,665,797 | ||||||||
| Balance | $ 1,202,669 | $ 1,056,697 | $ 1,202,669 | $ 1,056,697 | ||||||
| Common stock, shares issued | 39,665,797 | 39,147,153 | 39,665,797 | 39,147,153 | 2,530,000 | |||||
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 | |||||||
| Sale of stock, price per share (in dollars per share) | $ 45.75 | |||||||||
| Common Stock [Member] | ||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||||
| Balance (in shares) | 39,147,000 | 36,244,000 | ||||||||
| Balance | $ 391 | $ 362 | ||||||||
| Exercise/vesting of equity awards (in shares) | 519,000 | 351,000 | ||||||||
| Exercise/vesting of equity awards, value | $ 6 | $ 4 | ||||||||
| Issuance of stock (in shares) | [1] | 2,530,000 | ||||||||
| Issuance of stock, value | [1] | $ 25 | ||||||||
| Balance (in shares) | 39,666,000 | 39,125,000 | 39,666,000 | 39,125,000 | ||||||
| Balance | $ 397 | $ 391 | $ 397 | $ 391 | ||||||
| Common stock, shares issued | 39,666,000 | 39,125,000 | 39,147,000 | 36,244,000 | 39,666,000 | 39,147,000 | ||||
| Additional Paid-in Capital [Member] | ||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||||
| Balance | $ 538,788 | $ 412,961 | ||||||||
| Exercise/vesting of equity awards, value | 2,875 | 730 | ||||||||
| Excess income tax benefit from stock-based awards | 2,040 | 2,197 | ||||||||
| Equity award compensation expense | 12,418 | 9,035 | ||||||||
| Issuance of stock, value | [1] | 110,395 | ||||||||
| Other | (114) | |||||||||
| Balance | $ 556,121 | $ 535,204 | 556,121 | 535,204 | ||||||
| Retained Earnings [Member] | ||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||||
| Balance | 570,310 | 428,069 | ||||||||
| Net earnings | 75,841 | 93,033 | ||||||||
| Balance | $ 646,151 | $ 521,102 | $ 646,151 | $ 521,102 | ||||||
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| X | ||||||||||
- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. No definition available.
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| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. No definition available.
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