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Consolidated Statement of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 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 56,300       388 55,912
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     13      
Share-based compensation (6,585) $ 2 $ (9,516) 2,929    
Share-based compensation, Shares   187 147      
Exercise of stock options $ 3,122 $ 2   3,120    
Exercise of stock options, Shares 243 243        
Ending Balance at Mar. 31, 2017 $ 826,523 $ 519 $ (98,910) 218,667 $ (522) 706,769
Ending Balance, Shares at Mar. 31, 2017   51,939 4,110      
Cumulative effect from the adoption of accounting pronouncements, net of taxes       $ 59   $ (59)