Leases (Schedule of Components of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Finance lease
Amortization of right-of-use asset	$ 253
Interest on lease liabilities	399
Operating lease
Fixed lease cost	1,217
Variable lease cost	57
Short-term lease cost	332
Total lease expense	$ 2,258	$ 2,100