Background and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Sales revenues	$ 0	$ 15,567	$ 0	$ 31,140
Sales cost of revenues	0	17,850	0	32,840
Services revenues	62,640	50,265	181,559	127,812
Services cost of revenues	22,356	13,203	60,794	39,684
Other current assets	(23,955)		(23,955)		$ (21,014)	[1]
Accounts receivable	$ 9,843		$ 9,843		10,451	[1]
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Sales revenues		(100)		(500)
Sales cost of revenues		(300)		(700)
Services revenues		500		1,000
Services cost of revenues		$ 300		$ 1,000
Other current assets					1,200
Accounts receivable					$ 1,200

[1] Derived from audited consolidated financial statements as of and for the year ended December 31, 2016.