Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings (Accumulated Deficit) [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock, at Cost [Member]
Beginning balance at Dec. 31, 2013   $ 1,868 $ 2,101,350 $ (978,291) $ (26,276) $ (10,635)
Beginning balance, Shares at Dec. 31, 2013   185,861,777        
Issuance of shares under equity-based compensation plans, shares   337,258        
Issuance of shares under equity-based compensation plans   4 1,953      
Net income 64,487     64,487    
Other comprehensive income (loss), net of tax         76  
Equity-based compensation     2,622      
Tax benefit from shares issued under equity-based compensation plans     1,542      
Ending balance at Mar. 31, 2014 1,158,700 1,872 2,107,467 (913,804) (26,200) (10,635)
Ending balance, Shares at Mar. 31, 2014   186,199,035        
Beginning balance at Dec. 31, 2014 1,307,619 1,888 2,141,433 (741,519) (83,548) (10,635)
Beginning balance, Shares at Dec. 31, 2014 187,831,389 187,831,389        
Issuance of shares under equity-based compensation plans, shares   1,578,085        
Issuance of shares under equity-based compensation plans   16 11,983      
Net income 39,476     39,476    
Other comprehensive income (loss), net of tax         (34,064)  
Equity-based compensation     3,959      
Tax benefit from shares issued under equity-based compensation plans     10,365      
Ending balance at Mar. 31, 2015 $ 1,339,354 $ 1,904 $ 2,167,740 $ (702,043) $ (117,612) $ (10,635)
Ending balance, Shares at Mar. 31, 2015 189,409,474 189,409,474