Leases (Schedule of Operating Lease Payments) (Details) - USD ($) $ in Thousands		Mar. 31, 2019		Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease minimum payments, Due Next Twelve Months		$ 2,665
Operating lease minimum payments, Due Year Two		3,433
Operating lease minimum payments, Due Year Three		3,270
Operating lease minimum payments, Due Year Four		3,123
Operating lease minimum payments, Due Year Five		2,991
Operating lease minimum payments, Due after Year Five		24,318
Total operating lease payments	[1]	39,800
Interest		9,613
Present value of operating lease liabilities		$ 30,187	[2]	$ 30,853	$ 0

[1] Includes $4.7 million related to options to extend lease terms that are reasonably certain of being exercised.

[2] Includes short-term operating lease liabilities of $2.5 million.