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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
BALANCE (in shares) at Dec. 31, 2015   25,706        
BALANCE at Dec. 31, 2015 $ 918,252 $ 257 $ 291,092 $ 926,169 $ (137,984) $ (161,282)
Net income (loss) 147,065     147,065    
Other comprehensive income (loss), net of taxes (8,960)       (8,960)  
Purchases of treasury stock (129,187)         (129,187)
Net issuance of treasury shares to employee stock compensation plans (in shares)   (43)        
Net issuance of treasury shares to employee stock compensation plans 2,193 $ 0 (20,963)     23,156
Stock-based compensation 20,770   20,770      
Cash dividends, net of estimated forfeitures relative to participating securities (19,933)     (19,933)    
BALANCE (in shares) at Dec. 31, 2016   25,663        
BALANCE at Dec. 31, 2016 930,200 $ 257 290,899 1,053,301 (146,944) (267,313)
Net income (loss) 213,442     213,442    
Other comprehensive income (loss), net of taxes 23,718       23,718  
Purchases of treasury stock (42,084)         (42,084)
Net issuance of treasury shares to employee stock compensation plans (in shares)   (148)        
Net issuance of treasury shares to employee stock compensation plans 571 $ (2) (18,293)     18,866
Stock-based compensation 18,855   18,855      
Cash dividends, net of estimated forfeitures relative to participating securities (20,420)     (20,420)    
BALANCE (in shares) at Dec. 31, 2017   25,515        
BALANCE at Dec. 31, 2017 1,124,282 $ 255 291,461 1,246,323 (123,226) (290,531)
Net income (loss) 157,772     157,772    
Other comprehensive income (loss), net of taxes (14,396)       (14,396)  
Tax effects reclassified from accumulated other comprehensive income       150 (150)  
Purchases of treasury stock (183,918)         (183,918)
Net issuance of treasury shares to employee stock compensation plans (in shares)   (21)        
Net issuance of treasury shares to employee stock compensation plans 2,717   (17,352)     20,069
Stock-based compensation 18,665   18,665      
Cash dividends, net of estimated forfeitures relative to participating securities (20,825)     (20,825)    
BALANCE (in shares) at Dec. 31, 2018   25,494        
BALANCE at Dec. 31, 2018 $ 1,095,694 $ 255 $ 292,774 $ 1,394,817 $ (137,772) $ (454,380)