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Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 30, 2015 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2014 $ 476,232 $ 497 $ (53,770) $ 158,549 $ (35) $ 370,991
Beginning Balance, Shares at Dec. 31, 2014   49,746 3,002      
Comprehensive income 59,675       (280) 59,955
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     10      
Exercise of stock options 2,700 $ 2   2,698    
Exercise of stock options, Shares   167        
Excess tax benefits 3,472     3,472    
Share-based compensation 1,248 $ 3 $ (4,230) 5,475    
Share-based compensation, Shares   324 92      
Ending Balance at Jun. 30, 2015 $ 543,327 $ 502 $ (58,000) $ 170,194 $ (315) $ 430,946
Ending Balance, Shares at Jun. 30, 2015   50,237 3,104