Inventory (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 41,561			$ 31,354
Work-in-progress	22,218			21,487
Finished goods	6,875			11,743
Total	70,654			$ 64,584
Inventory write-down, obsolescence	$ 7,400	$ 16,700	$ 25,100
Inventory write-down, market conditions		$ 15,700	$ 15,700