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Related Parties - Summary of Balance Outstanding of Related Parties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transactions [Abstract]          
Net revenue $ 5,684 $ 4,174 $ 13,322 $ 16,271  
Operating expenses 340 1,258 1,378 6,089  
Interest expense 310 351 996 1,047  
Dividends received 21,886 $ 2,027 24,260 $ 2,659  
Accounts receivable 5,138   5,138   $ 8,654
Long-term debt 30,015   30,015   35,289
Accounts payable $ 390   $ 390   $ 1,925