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Liabilities - Components of Accounts Payable, Accrued Expenses, and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]      
Accounts payable $ 20,693   $ 20,214
Accrued expenses 9,234   34,557
Subsidiary unit awards 129   200
Other current liabilities 3,510   3,459
Accounts payable, accrued expenses and other current liabilities $ 33,566 $ 1,548 $ 58,430