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Debt - Cash Pooling (Details)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Number of cash pools   2  
QRS Cash Pool      
Debt Instrument [Line Items]      
Cash pool agreement, borrowings, maximum $ 10,000    
Cash pool agreement, cash position, net   $ 2,000 $ 5,700
Cash pool agreement, cash position, gross   300,800 383,700
Cash pool agreement, outstanding borrowings   298,800 378,000
TRS Cash Pool      
Debt Instrument [Line Items]      
Cash pool agreement, cash position, net   2,200 0
Cash pool agreement, cash position, gross   281,500 229,600
Cash pool agreement, outstanding borrowings   $ 279,300 $ 229,600