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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Grant Date Fair Value Per Share      
Additional paid-in capital $ (3,412,509) $ (3,177,982)  
Reclassification as result of award modification      
Weighted Average Grant Date Fair Value Per Share      
Additional paid-in capital $ 200    
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units      
Shares      
Non-vested awards at the beginning of the period (in shares) 1,728,000    
Granted (in shares) 1,404,000    
Vested (in shares) (957,000)    
Canceled (in shares) (153,000)    
Non-vested awards at the end of the period (in shares) 2,022,000 1,728,000  
Weighted Average Grant Date Fair Value Per Share      
Non-vested awards at the beginning of the period (usd per share) $ 9.68    
Granted (usd per share) 10.01 $ 9.66 $ 12.95
Vested (usd per share) 8.85    
Canceled (usd per share) 10.33    
Non-vested awards at the end of the period (usd per share) $ 10.25 $ 9.68  
Fair value of vested shares $ 9,000 $ 8,200 $ 10,800
Cash Settled Restricted Stock Units And Cash Settled Performance Units      
Shares      
Non-vested awards at the end of the period (in shares) 376,000    
Restricted Stock Restricted Stock Units And Performance Units      
Shares      
Non-vested awards at the end of the period (in shares) 1,646,000    
On exercise of options and vesting of performance-based restricted stock units      
Stock-based compensation      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted in Period 99,631