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Basis of Presentation - Covid 19 (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 17, 2020
USD ($)
Mar. 31, 2020
USD ($)
item
Mar. 31, 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   $ 400,000 $ 10,000    
Cash and cash equivalents - unrestricted   662,156 $ 94,873   $ 362,430
Revolving Credit Facility [Member] | $700 Million Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Amounts drawn $ 400,000        
Maximum borrowing capacity   700,000      
Remaining borrowing capacity   $ 299,100      
Subsequent event          
Debt Instrument [Line Items]          
Dividends permitted amount per quarter | $ / shares       $ 0.01  
Subsequent event | Sixth Amended And Restated Credit Agreement [Member]          
Debt Instrument [Line Items]          
Dividends permitted amount per quarter | $ / shares       $ 0.01