Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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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
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      
[1] In January 2014, we issued 2,530,000 shares of common stock in a secondary public offering, par value $0.01 per share, at a price of $45.75 per share.