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Preferred Units and Warrants (Details) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 02, 2018 USD ($) tranche $ / shares shares	Jun. 30, 2018 $ / shares	Dec. 31, 2018 USD ($) $ / shares	Nov. 13, 2018 shares
Cash distributions on Preferred Units			$ (36,430)
Ending balance			$ 477,309
EIG
Number of tranches of warrants | tranche	2
Series A Preferred Units
Distribution per unit (in dollars per share) | $ / shares		$ 24.107
Preferred units, if redeemed, electable to be paid in common units (as a percent)			50.00%
Beginning balance
Issuance of Preferred Units on April 2, 2018, net			465,121
Net income allocated for April 2, 2018 through December 31, 2018			36,430
Cash distributions on Preferred Units			$ (24,242)
Conversion rate numerator value plus unpaid cash distributions on the applicable Preferred Unit | $ / shares			$ 1,000
Conversion rate denominator for each Preferred Unit | $ / shares			$ 20.0115
Ending balance			$ 477,309
Series A Preferred Units | On or after April 2, 2021
Preferred units convertible into common units at option of unitholders (as a percent)			33.33%
Series A Preferred Units | On or after April 2, 2022
Preferred units convertible into common units at option of unitholders (as a percent)			66.67%
Series A Preferred Units | On or after April 2, 2023
Preferred units convertible into common units at option of unitholders (as a percent)			100.00%
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
Common units
Common units that are potentially issuable | shares				41,202,553
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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