Leases (Supplemental cash flow information related to leases) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating cash flows for operating leases	$ 856	$ 2,131	$ 1,243	$ 4,117
Operating cash flows for finance leases	85	0	179	0
Financing cash flows for finance leases	$ 869	$ 0	$ 1,728	$ 0