Leases (Schedule of lease costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Amortization of finance leased assets	$ 0	$ 0	$ 0	$ 1,248
Interest on finance lease liabilities	0	0	0	33
Operating lease cost	532	1,043	2,763	3,053
Short-term lease cost	2,231	3,120	8,049	7,893
Variable lease cost	0	0	0	0
Total lease cost	2,763	4,163	10,812	12,227
Capitalized costs included in short-term lease costs	$ 200	$ 800	$ 1,400	$ 1,000