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Consolidated Statement of Stockholders' Equity (Unaudited) - 6 months ended Jun. 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 96,061       302 95,759
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     16      
Share-based compensation (3,428) $ 2 $ (9,657) 6,227    
Share-based compensation, Shares   192 149      
Exercise of stock options 5,895 $ 5   5,890    
Exercise of stock options, Shares   467        
Ending Balance at Jun. 30, 2017 $ 872,214 $ 522 $ (99,051) 224,735 $ (608) 746,616
Ending Balance, Shares at Jun. 30, 2017   52,168 4,115      
Cumulative effect from the adoption of accounting pronouncements, net of taxes       $ 59   $ (59)