Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Interest rate swap liability	$ 894	$ 1,865
Other	758	223
Other liabilities	11,691	13,034
Pension plan
Pension and supplemental executive retirement plan liability	2,280	2,931
SERP
Pension and supplemental executive retirement plan liability	$ 7,759	$ 8,015