Leases (Schedule of lease assets and liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating right of use asset	$ 6,937	$ 5,673
Finance right of use assets	16,926	17,396
Total right of use assets	23,863	23,069
Current operating lease liability	4,128	3,430
Current finance lease liability	5,852	4,164
Operating lease liability	2,639	2,071
Finance lease liability	502	3,215
Total lease liability	$ 13,121	$ 12,880