Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Liabilities
Interest rate swap liability	$ 1,648	$ 1,865
Other	286	223
Total	11,165	13,034
Pension plan
Other Liabilities
Pension and supplemental executive retirement plan liability	1,626	2,931
SERP
Other Liabilities
Pension and supplemental executive retirement plan liability	$ 7,605	$ 8,015