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Debt, Commitments and Contingencies - Repurchase of Subsidiary Units (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Subsidiary unit awards
Related Party Transaction [Line Items]
Settlements	$ 0	$ 0	$ 200	$ 2,802
Founder and President | Repurchase of Subsidiary Units, February 2011
Related Party Transaction [Line Items]
Due to related parties, current	100		100		$ 200
Due to related parties, noncurrent	$ 100		100		$ 200
Founder and President | Subsidiary unit awards | Repurchase of Subsidiary Units, February 2011
Related Party Transaction [Line Items]
Settlements			$ 200

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