Accrued Liabilities an Other Long-term Liabilities Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Long-term Liabilities [Abstract]
Contract liabilities	$ 40,148	$ 0
Deferred Revenue, Noncurrent	7,099	0
Benefits	2,104	1,107
Other	5,975	0
OTHER LONG-TERM LIABILITIES	$ 55,326	$ 1,107