Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 1,495	$ 4,367
Finance lease expense:
Amortization of right-of-use assets	142	203
Interest on lease liabilities	20	31
Total finance lease expense	162	234
Short-term lease expense	132	679
Variable lease expense	$ 904	$ 2,614