Liabilities - Components of Accounts Payable, Accrued Expenses, and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accounts payable	$ 20,051	$ 18,289
Accrued expenses	4,853	5,298
Subsidiary unit awards	2,711	2,506
Other current liabilities	4,214	2,207
Accounts payable, accrued expenses and other current liabilities	$ 31,829	$ 28,300