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Debt Obligations (2016 Credit Facility) (Details)
$ in Millions
Sep. 30, 2018
USD ($)
$400 million senior unsecured term loan facility due November 25, 2019 (average interest rate of 3.37% for the period January 1, 2018 through September 30, 2018)  
Debt Instrument [Line Items]  
Remaining amount outstanding $ 100