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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Jan. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance, shares     39,147,153      
Balance     $ 1,109,489 $ 841,392    
Net earnings $ 29,133 $ 35,079 45,533 60,456    
Exercise/vesting of equity awards, value     2,839 707    
Excess income tax benefit from stock-based awards     2,012 2,194    
Equity award compensation expense     $ 8,465 5,264    
Issuance of stock, value [1]       110,420    
Other       (114)    
Balance, shares 39,660,997   39,660,997      
Balance $ 1,168,338 $ 1,020,319 $ 1,168,338 $ 1,020,319    
Common stock, shares issued 39,660,997   39,147,153   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, shares     39,147,000 36,244,000    
Balance     $ 391 $ 362    
Exercise/vesting of equity awards, shares     514,000 348,000    
Exercise/vesting of equity awards, value     $ 6 $ 4    
Issuance of stock, shares [1]       2,530,000    
Issuance of stock, value [1]       $ 25    
Balance, shares 39,661,000 39,122,000 39,661,000 39,122,000    
Balance $ 397 $ 391 $ 397 $ 391    
Common stock, shares issued 39,661,000 39,122,000 39,147,000 36,244,000 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     2,833 703    
Excess income tax benefit from stock-based awards     2,012 2,194    
Equity award compensation expense     8,465 5,264    
Issuance of stock, value [1]       110,395    
Other       (114)    
Balance $ 552,098 $ 531,403 552,098 531,403    
Retained Earnings [Member]            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance     570,310 428,069    
Net earnings     45,533 60,456    
Balance $ 615,843 $ 488,525 $ 615,843 $ 488,525    
[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.