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Debt - Cash Pool (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
cash_pool
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 2  
QRS Cash Pool    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 1  
Gross Cash Position $ 573,600 $ 372,100
Outstanding Debit Balances (573,000) (369,000)
Net Cash Position $ 600 3,100
TRS Cash Pool    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 1  
Gross Cash Position $ 363,800 319,800
Outstanding Debit Balances (362,600) (301,300)
Net Cash Position $ 1,200 $ 18,500