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Consolidated Statement of Stockholders' Equity - 3 months ended Mar. 31, 2017 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in-Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance, shares at Dec. 31, 2016   25,663        
Beginning balance at Dec. 31, 2016 $ 930,200 $ 257 $ 290,899 $ 1,053,301 $ (146,944) $ (267,313)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 33,939 0 0 33,939 0 0
Other comprehensive income (loss), net of tax 6,795 $ 0 0 0 6,795 0
Stock Issued During Period, Shares, Employee Stock Purchase Plans   (86)        
Stock Issued During Period, Value, Employee Stock Purchase Plan (2,898) $ (1) (11,507) 0 0 8,610
Stock-based compensation 6,063 0 6,063 0 0 0
Cash dividends (5,139) $ 0 0 (5,139) 0 0
Ending balance, shares at Mar. 31, 2017   25,577        
Ending balance at Mar. 31, 2017 $ 968,960 $ 256 285,455 $ 1,082,101 $ (140,149) $ (258,703)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     $ 0