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Debt - Cash Pool (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
cash_pool
Dec. 31, 2020
USD ($)
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 $ 567,300 $ 448,700
OUTSTANDING DEBIT BALANCES (566,700) (447,400)
NET CASH POSITION $ 600 1,300
TRS Cash Pool    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 1  
GROSS CASH POSITION $ 512,700 555,500
OUTSTANDING DEBIT BALANCES (510,200) (553,500)
NET CASH POSITION $ 2,500 $ 2,000