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Condensed Consolidated Statement 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, 2017   25,515        
BALANCE at Dec. 31, 2017 $ 1,124,282 $ 255 $ 291,461 $ 1,246,323 $ (123,226) $ (290,531)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 92,277          
Other comprehensive income (loss), net of taxes (3,132)       (3,132)  
Purchases of treasury stock (51,276)         (51,276)
Net issuance of treasury shares to employee stock compensation plans (in shares)   (3)        
Net issuance of treasury shares to employee stock compensation plans 12   (12,833)     12,845
Stock-based compensation 9,864   9,864      
Dividends paid, net of estimated forfeitures relative to participating securities (10,812)     (10,812)    
BALANCE (in shares) at Jun. 30, 2018   25,512        
BALANCE at Jun. 30, 2018 1,172,612 $ 255 288,492 1,339,185 (126,358) (328,962)
BALANCE (in shares) at Mar. 31, 2018   25,527        
BALANCE at Mar. 31, 2018 1,178,079 $ 255 286,244 1,288,052 (105,950) (290,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 56,463          
Other comprehensive income (loss), net of taxes (20,408)       (20,408)  
Purchases of treasury stock (42,077)         (42,077)
Net issuance of treasury shares to employee stock compensation plans (in shares)   (15)        
Net issuance of treasury shares to employee stock compensation plans 1,650   (1,987)     3,637
Stock-based compensation 4,235   4,235      
Dividends paid, net of estimated forfeitures relative to participating securities (5,330)     (5,330)    
BALANCE (in shares) at Jun. 30, 2018   25,512        
BALANCE at Jun. 30, 2018 1,172,612 $ 255 288,492 1,339,185 (126,358) (328,962)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 87,873          
Other comprehensive income (loss), net of taxes (14,758)       (14,758)  
Net issuance of treasury shares to employee stock compensation plans (in shares)   16        
Net issuance of treasury shares to employee stock compensation plans 1,006   (14,554)     15,560
Stock-based compensation 9,977   9,977      
Dividends paid, net of estimated forfeitures relative to participating securities (9,666)     (9,666)    
BALANCE (in shares) at Jun. 30, 2019   25,510        
BALANCE at Jun. 30, 2019 1,164,065 $ 255 288,197 1,466,963 (152,530) (438,820)
BALANCE (in shares) at Mar. 31, 2019   25,522        
BALANCE at Mar. 31, 2019 1,127,713 $ 255 287,115 1,422,576 (138,749) (443,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 49,225          
Other comprehensive income (loss), net of taxes (13,781)       (13,781)  
Net issuance of treasury shares to employee stock compensation plans (in shares)   (12)        
Net issuance of treasury shares to employee stock compensation plans 1,836   (2,828)     4,664
Stock-based compensation 3,910   3,910      
Dividends paid, net of estimated forfeitures relative to participating securities (4,838)     (4,838)    
BALANCE (in shares) at Jun. 30, 2019   25,510        
BALANCE at Jun. 30, 2019 $ 1,164,065 $ 255 $ 288,197 $ 1,466,963 $ (152,530) $ (438,820)