Leases (Schedule of lease assets and liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating right of use asset	$ 7,315	$ 0
Finance right of use assets	17,946
Total right of use assets	25,261
Current operating lease liability	4,291	0
Current finance lease liability	4,122
Operating lease liability	2,800	$ 0
Finance lease liability	4,273
Total lease liability	$ 15,486