Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Taxes [Abstract]
Income tax benefit	$ 2,184,000	$ 4,801,000
Effective income tax rate	5.50%	21.50%
Tax receivable agreement, percentage of net cash saving realized assigned	85.00%
Tax receivable agreement, minimum percentage of the Joint Venture outstanding units required to be owned	20.00%
Additional tax receivable agreement, percentage net cash tax savings Company required to pay arising from certain tax basis increases and imputed interest deductions	85.00%
Net cash tax savings, obligation	$ 0
Letter agreement, percentage of tax savings required to pay if amount of deductions allocated to Company are in excess of specified minimum threshold	100.00%