Leases (Schedule of lease costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Amortization of finance leased assets	$ 0	$ 1,067
Interest on finance lease liabilities	0	29
Operating lease cost	1,308	1,047
Short-term lease cost	3,536	1,444
Variable lease cost	0	58
Total lease cost	4,844	3,645
Capitalized costs included in short-term lease costs	$ 500	$ 100