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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Paid-in Capital
Treasury Stock, at cost
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2016 $ 746,577 $ 250 $ 688,424 $ 0 $ 33,449 $ 24,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends on common shares (24,667)       (24,667)  
Employee stock-based compensation expense 10,437   10,437      
Issuance of shares of common stock under long-term incentive plan 1,244   1,244      
Warrants exercised 20   20      
Purchase of common stock under share repurchase program (302,109)     (302,109)    
Total comprehensive income (loss) 234,363       238,450 (4,087)
Ending Balance at Dec. 31, 2017 665,865 250 700,125 (302,109) 247,232 20,367
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends on common shares (32,143)       (32,143)  
Employee stock-based compensation expense 17,519   17,519      
Warrants exercised 9   9      
Purchase of common stock under share repurchase program (281,774)     (281,774)    
Common stock withheld related to net share settlement of equity awards (161)   (161)      
Total comprehensive income (loss) 335,506       312,577 22,929
Ending Balance at Dec. 31, 2018 704,821 250 717,492 (583,883) 527,666 43,296
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends on common shares (30,040)       (30,040)  
Employee stock-based compensation expense 21,989   21,989      
Issuance of shares of common stock under long-term incentive plan 2 2        
Warrants exercised 32   32      
Purchase of common stock under share repurchase program (243,498)     (243,498)    
Common stock withheld related to net share settlement of equity awards (8,962)   (8,962)      
Total comprehensive income (loss) 196,192       233,799 (37,607)
Ending Balance at Dec. 31, 2019 $ 640,536 $ 252 $ 730,551 $ (827,381) $ 731,425 $ 5,689