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Consolidated Statements of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2018 - 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, 2017 $ 985,951 $ 523 $ (100,694) $ 232,670 $ (724) $ 854,176
Beginning Balance, Shares at Dec. 31, 2017   52,277 4,152      
Comprehensive income 120,084       365 119,719
Adoption impact - ASU 2018-02 | Accounting Standards Update 2018-02 [Member]         (156) 156
Common stock purchased for treasury (1,539)   $ (1,539)      
Common stock purchased for treasury, shares     15      
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     9      
Share-based compensation (4,790) $ 2 $ (11,524) 6,732    
Share-based compensation, Shares   163 119      
Exercise of stock options $ 1,768 $ 1   1,767    
Exercise of stock options, Shares 112 112        
Ending Balance at Jun. 30, 2018 $ 1,100,300 $ 526 $ (113,757) $ 241,169 $ (515) 972,877
Ending Balance, Shares at Jun. 30, 2018   52,552 4,295      
Cumulative effect from the adoption of accounting pronouncements, net of taxes $ (1,174)         $ (1,174)