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Basis of Presentation - Covid 19 (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
item
Sep. 30, 2020
USD ($)
Apr. 23, 2020
$ / shares
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]          
Number of weeks employee severance compensation paid | item 1        
Cash and cash equivalents - unrestricted   $ 52,162   $ 362,430 $ 101,786
Revolving Credit Facility [Member] | $700 Million Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Remaining borrowing capacity   $ 664,100      
Sixth Amended And Restated Credit Agreement [Member]          
Debt Instrument [Line Items]          
Dividends permitted amount per quarter | $ / shares     $ 0.01