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Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2017 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2016 $ 773,686 $ 515 $ (89,394) $ 212,559 $ (910) $ 650,916
Beginning Balance, Shares at Dec. 31, 2016   51,509 3,950      
Comprehensive income 135,375       312 135,063
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     19      
Share-based compensation (95) $ 2 $ (9,657) 9,560    
Share-based compensation, Shares   192 149      
Exercise of stock options 6,755 $ 5   6,750    
Exercise of stock options, Shares   537        
Ending Balance at Sep. 30, 2017 $ 915,721 $ 522 $ (99,051) 228,928 $ (598) 785,920
Ending Balance, Shares at Sep. 30, 2017   52,238 4,118      
Cumulative effect from the adoption of accounting pronouncements, net of taxes       $ 59   $ (59)