Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other Liabilities
Interest rate swap liability	$ 640	$ 0
Excess joint venture distributions and other	2,763	2,800
Total	13,245	12,698
Derivative asset, noncurrent		93
Pension plan
Other Liabilities
Pension and supplemental executive retirement plan liability	2,133	2,148
SERP
Other Liabilities
Pension and supplemental executive retirement plan liability	$ 7,709	$ 7,750