Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Deposits and amounts due to customers	$ 4,048	$ 2,688
Dividends payable	4,455	4,260
Accrued litigation and professional fees	606	452
Current portion of environmental reserves	1,022	605
Other accrued expenses	4,362	5,078
Other current liabilities, Total	$ 14,493	$ 13,083