Leases (Schedule of lease assets and liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Right of use asset	$ 5,592	$ 5,673
Finance Lease, Right-of-Use Asset	7,281	17,396
Right-of-use asset	12,873	23,069
Operating Lease, Liability, Current	4,075	3,430
Finance Lease, Liability, Current	3,216	4,164
Operating Lease, Liability, Noncurrent	1,445	2,071
Finance Lease, Liability, Noncurrent	0	3,215
Lease liability	$ 8,736	$ 12,880