Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Related party cost and expense:
Costs and Expenses, Related Party	$ 30,600	$ 23,700
Blackwater [Member]
Related party cost and expense:
Costs and Expenses, Related Party	30,568	23,656
Lease expenses | Blackwater [Member]
Related party cost and expense:
Costs and Expenses, Related Party	604	604
Lease expenses | Mercury [Member]
Related party cost and expense:
Costs and Expenses, Related Party	38
Printing expenses | Blackwater [Member]
Related party cost and expense:
Costs and Expenses, Related Party	1,103	349
Commission expenses | Blackwater [Member]
Related party cost and expense:
Costs and Expenses, Related Party	22,695	$ 22,703
Commission expenses | Mercury [Member]
Related party cost and expense:
Costs and Expenses, Related Party	$ 6,128