Equity - Class A Convertible Preferred Units (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended					9 Months Ended
	May 11, 2019	May 10, 2019	Apr. 05, 2019	Apr. 21, 2016	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Preferred Units
Accretion of beneficial conversion feature						$ 36,517	$ 18,573	$ 12,803	$ 8,983
Class A Convertible Preferred Units
Preferred Units
Temporary equity, issued (in units)				19,942,169								19,942,169
Oaktree Capital Management L.P. | Class A Convertible Preferred Units
Preferred Units
Proceeds from sale of convertible preferred units and warrants, net of offering costs				$ 235,000
Offering costs				$ 5,000
Accretion of beneficial conversion feature					$ 0		$ 18,600			$ 36,500	$ 40,400
Preferred units redeemed	12,473,191		7,468,978
Preferred units redemption price per unit excluding unpaid dividends	$ 13.2385		$ 13.389
Preferred unit redemption premium percentage	110.00%		111.25%
Convertible preferred units initial conversion price				$ 12.035
Preferred units accrued but unpaid distributions	$ 0.1437		$ 0.338
Preferred unit, redemption price per unit	$ 13.3822		$ 13.727
Preferred unit, redemption amount	$ 166,900		$ 102,500
Amount paid to preferred unitholders		$ 4,000
Distributions made to preferred unitholders distributions declared per unit		$ 0.3234
Warrant | Oaktree Capital Management L.P.
Preferred Units
Warrants outstanding (in units)				4,375,112
Warrants converted to common units (in units)			1,458,371
Proceeds from warrant exercises			$ 100