Leases (Schedule of Components of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finance lease
Amortization of right-of-use asset	$ 997
Interest on lease liabilities	1,563
Operating lease
Fixed lease cost	5,063
Variable lease cost	35
Short-term lease cost	1,283
Total lease expense	$ 8,941	$ 8,400	$ 9,700