Leases (Schedule of lease assets and liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating right of use asset	$ 4,443	$ 5,592
Finance right of use assets	7,032	7,281
Total right of use assets	11,475	12,873
Current operating lease liability	3,648	4,075
Current finance lease liability	2,149	3,216
Operating lease liability	741	1,445
Finance lease liability	0	0
Total lease liability	$ 6,538	$ 8,736