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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
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, Shares at Dec. 31, 2015   191,368,727        
Issuance of shares under equity-based compensation plans, shares   2,611,710        
Shares surrendered under equity-based compensation plans   (143,000)        
Ending balance, Shares at Dec. 31, 2016   193,837,437        
Beginning balance at Dec. 31, 2015   $ 1,923 $ 2,216,202 $ (812,394) $ (171,678) $ (11,333)
Issuance of shares under equity-based compensation plans   27 16,729      
Equity-based compensation     34,756      
Tax benefit from shares issued under equity-based compensation plans     14,327      
Net income $ 222,838     222,838    
Other comprehensive income (loss), net of tax (113,435)       (113,435)  
Net shares surrendered under equity-based compensation plans           (3,878)
Ending balance at Dec. 31, 2016 $ 1,394,084 $ 1,950 2,282,014 (589,556) (285,113) (15,211)
Issuance of shares under equity-based compensation plans, shares   2,275,595        
Shares surrendered under equity-based compensation plans   (411,932)        
Repurchase of common stock   (4,794,990)        
Ending balance, Shares at Dec. 31, 2017 190,906,110 190,906,110        
Issuance of shares under equity-based compensation plans   $ 22 9,927      
Equity-based compensation     41,835      
Cumulative effect of change in accounting principle     295      
Net income $ 193,764     193,764    
Cumulative effect of change in accounting principles       (206)    
Other comprehensive income (loss), net of tax 198,510       198,510  
Net shares surrendered under equity-based compensation plans           (15,405)
Repurchase of common stock           (175,000)
Ending balance at Dec. 31, 2017 $ 1,647,826 $ 1,972 2,334,071 (395,998) (86,603) (205,616)
Issuance of shares under equity-based compensation plans, shares   1,878,083        
Shares surrendered under equity-based compensation plans   (407,938)        
Ending balance, Shares at Dec. 31, 2018 192,376,255 192,376,255        
Issuance of shares under equity-based compensation plans   $ 19 6,111      
Equity-based compensation     44,900      
Net income $ 140,217     140,217    
Cumulative effect of change in accounting principles       6,004    
Other comprehensive income (loss), net of tax (72,602)       (72,602)  
Net shares surrendered under equity-based compensation plans           (15,707)
Ending balance at Dec. 31, 2018 $ 1,756,768 $ 1,991 $ 2,385,082 $ (249,777) $ (159,205) $ (221,323)