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Stock-Based Compensation - Unrecognized cost and 2020 Plan (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Stock-Based Compensation      
Additional paid-in capital $ 3,415,784   $ 3,412,509
2020 Plan | Subsequent Event      
Unrecognized compensation      
Number of shares authorized for issuance   8,500,000  
Reduction in number of shares available for issuance for each stock-settled award granted   1  
Cash Settled Restricted Stock Units and Cash Settled Performance Units      
Stock-Based Compensation      
Non-vested awards at the end of the period (in shares) 529,000    
Restricted Stock and Stock-settled Performance Units [Member]      
Stock-Based Compensation      
Non-vested awards at the end of the period (in shares) 2,539,000    
Restricted Stock, Restricted Stock Units, Performance Units, Cash Settled Restricted Stock Units and Cash Settled Performance Units      
Stock-Based Compensation      
Non-vested awards at the end of the period (in shares) 3,068,000   2,022,000
Unrecognized compensation      
Expected unrecognized compensation cost related to unvested awards (in dollars) $ 21,500    
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized 2 years 2 months 12 days