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Consolidated Statement of Stockholders' Equity - 3 months ended Mar. 31, 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 at Dec. 31, 2015 $ 918,252 $ 257 $ 291,092 $ 926,169 $ (137,984) $ (161,282)
Beginning balance, shares at Dec. 31, 2015   25,706        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 34,291 $ 0 0 34,291 0 0
Other comprehensive income (loss), net of tax (6,872) 0 0 0 (6,872) 0
Treasury Stock, Value, Acquired, Cost Method (31,945) 0 0 0 0 (31,945)
Stock Issued During Period, Value, Employee Stock Purchase Plan 1,243 $ 0 13,340 0 0 (12,097)
Stock Issued During Period, Shares, Employee Stock Purchase Plans   2        
Stock-based compensation 5,444 $ 0 5,444 0 0 0
Tax effect from options exercised and the vesting of restricted shares     (53)      
Cash dividends (5,134) 0 0 (5,134) 0 0
Ending balance at Mar. 31, 2016 $ 912,793 $ 257 $ 283,196 $ 955,326 $ (144,856) $ (181,130)
Ending balance, shares at Mar. 31, 2016   25,708