Income Taxes Income tax prior period adjustment (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Mar. 31, 2020	Mar. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
(Benefit) provision for income taxes	$ 2,303	$ (41,297)
Deferred Tax Liabilities, Gross	64,094		$ 70,116
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	7,941	5,061
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	6,954	43,624
Liabilities	2,441,306		2,449,399
Accumulated deficit	(257,321)		(272,216)
Members' Equity	$ 1,153,036	$ 1,240,519	$ 1,143,933	$ 1,143,933	$ 2,173,150
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.02	$ 0.15
Earnings Per Share, Basic	0.05	0.17
Income (Loss) from Continuing Operations, Per Diluted Share	0.02	0.15
Earnings Per Share, Diluted	$ 0.05	$ 0.17