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Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 2016 - 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, 2015   25,706        
Beginning balance at Dec. 31, 2015 $ 918,252 $ 257 $ 291,092 $ 926,169 $ (137,984) $ (161,282)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 116,237 0 0 116,237 0 0
Other comprehensive income (loss), net of tax (19,462) 0 0 0 (19,462) 0
Treasury Stock, Value, Acquired, Cost Method (129,187) $ 0 0 0 0 (129,187)
Stock Issued During Period, Shares, Employee Stock Purchase Plans   (32)        
Stock Issued During Period, Value, Employee Stock Purchase Plan 1,452 $ 0 18,767 0 0 20,219
Stock-based compensation 14,693 0 14,693 0 0 0
Cash dividends (15,013) $ 0 0 (15,013) 0 0
Ending balance, shares at Sep. 30, 2016   25,674        
Ending balance at Sep. 30, 2016 $ 886,972 $ 257 287,018 $ 1,027,393 $ (157,446) $ (270,250)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     $ (145)