Leases (Maturities of lease liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Finance Lease Liabilities Payments Due [Abstract]
2021	$ 142,702
2022	122,157
2023	85,912
2024	48,427
2025	12,197
Thereafter	0
Total lease payments	411,395
Less: imputed interest	(26,890)
Financing lease liability	384,505
Operating Lease Liabilities Payments Due [Abstract]
2021	23,774
2022	22,123
2023	14,404
2024	4,974
2025	3,135
Thereafter	60,040
Total lease payments	128,450
Less: inputed interest	(49,116)
Operating lease liability	$ 79,334	$ 92,510