Related Party Transactions (Summary of Revenue Recognized/Amounts Paid Related to Service Provided to/from Portfolio Companies) (Details) - Blackstone Portfolio Companies [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Revenue recognized related to services provided	$ 934		$ 2,815
Amount paid related to services received	$ 3,883		$ 13,341