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Preferred Units and Warrants (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 02, 2018 USD ($) tranche $ / shares shares	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($)
Beginning balance				$ 477,309
Cash distributions on Preferred Units		$ (12,188)	$ (12,188)	(36,563)	$ (24,242)
Ending balance		477,309		477,309
EIG
Number of tranches of warrants | tranche	2
Series A Preferred Units
Beginning balance				477,309
Net income allocated to Preferred Units				36,563
Cash distributions on Preferred Units				(36,563)
Ending balance		$ 477,309		$ 477,309
Series A Preferred Units | Quarterly
Distribution per unit (in dollars per share) | $ / shares				$ 24.375
Series A Preferred Units | EIG
Proceeds from private placement sale	$ 500,000
Units issued | shares	500,000
Face value (per unit) | $ / shares	$ 1,000
Tranche 1 | Common units | EIG
Number of shares that can be purchased on the warrant | shares	5,000,000
Warrant strike price | $ / shares	$ 17.03
Tranche 2 | Common units | EIG
Number of shares that can be purchased on the warrant | shares	10,000,000
Warrant strike price | $ / shares	$ 19.59

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Exercise price per share or per unit of warrants or rights outstanding.

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