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Transactions with Related Parties (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Transactions with Related Parties
Revenue from related parties		$ 5,099	$ 4,271	$ 15,523	$ 12,807
Minimum
Transactions with Related Parties
Outstanding common units held by preferred units for right to designate a member of the Board (as a percent)				5.00%
ETO
Transactions with Related Parties
Medical, dental and other healthcare benefits					1,900
401(k) contribution cost					900
Related party, general and administrative expenses					$ 1,800
Limited partner | ETO
Transactions with Related Parties
Ownership interest (as a percent)	48.00%
General partner | ETO
Transactions with Related Parties
Ownership interest (as a percent)	100.00%
ETO
Transactions with Related Parties
Related party receivables	$ 44,900	44,900		$ 44,900		$ 44,900
401(k) match (as a percent)					3.00%
Entities affiliated with ETO
Transactions with Related Parties
Revenue from related parties		5,100	$ 4,300	15,500	$ 12,800
Related party receivables	3,700	3,700		3,700		2,700
Related party payables	$ 2	$ 2		$ 2		$ 400

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Amount of cost for defined contribution plan.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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The requirement for the percentage of outstanding common units to be held by preferred units for the right to designate one of the members of the Board.

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