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Fair Value Measurements (Details) - Debt Obligations - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recorded value $ 2,437,481 $ 2,456,867
Deferred financing costs 15,924 18,041
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value $ 2,470,068 $ 2,467,317