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Debt - Cash Pool (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
cash_pool
Dec. 31, 2018
USD ($)
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 $ 308,200 $ 300,800
Outstanding Debit Balances (306,500) (298,800)
Net Cash Position $ 1,700 2,000
TRS Cash Pool    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 1  
Gross Cash Position $ 295,500 281,500
Outstanding Debit Balances (292,700) (279,300)
Net Cash Position $ 2,800 $ 2,200