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Description of the Business and Summary of Significant Accounting Policies - Covid 19 (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2020
Apr. 23, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Dividends permitted amount per quarter   $ 0.01    
Cash and cash equivalents - unrestricted $ 56,697   $ 362,430 $ 103,437
Revolving Credit Facility [Member] | $700 Million Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Remaining borrowing capacity $ 593,200      
Sixth Amended And Restated Credit Agreement [Member]        
Debt Instrument [Line Items]        
Dividends permitted amount per quarter   $ 0.01