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Basis of Presentation - Covid 19 (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
item
Jun. 30, 2019
USD ($)
Apr. 23, 2020
$ / shares
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Number of weeks employee severance compensation paid | item 1      
Amounts drawn $ 25,000 $ 4,000    
Cash and cash equivalents - unrestricted 82,376 $ 103,842   $ 362,430
Revolving Credit Facility [Member] | $700 Million Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Remaining borrowing capacity $ 674,100      
Sixth Amended And Restated Credit Agreement [Member]        
Debt Instrument [Line Items]        
Dividends permitted amount per quarter | $ / shares     $ 0.01