Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Accrued Rent	$ 5,142	$ 4,763
Deferred Revenue	460	2,245
Other Accrued Liabilities	2,855	3,002
Other Accrued Liabilities, Current	$ 8,457	$ 10,010