Other Current Assets and Other Accrued Expenses - Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets And Other Accrued Expenses Disclosure [Abstract]
Prepaid property taxes	$ 534	$ 421
Prepaid insurance	518	448
Income taxes receivable	1,153	68
Other	2,130	1,558
Other current assets	$ 4,335	$ 2,495