Leases (Supplemental cash flow information related to leases) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating cash flows for operating leases	$ 651	$ 399	$ 1,894	$ 4,516
Operating cash flows for finance leases	77	0	256	0
Financing cash flows for finance leases	$ 876	$ 0	$ 2,604	$ 0