Accrued Liabilities an Other Long-term Liabilities Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Long-term Liabilities [Abstract]
Contract liabilities	$ 14,020	$ 40,148
Deferred Revenue, Noncurrent	468	7,099
Benefits	962	2,104
Accrued Rent	1,779	0
contract settlement	1,667	0
Other	1,696	5,975
OTHER LONG-TERM LIABILITIES	$ 20,592	$ 55,326