Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 154,382	$ 194,332	$ 481,282	$ 530,566
Cost of sales	119,683	151,702	376,320	412,202
Gross profit	34,699	42,630	104,962	118,364
Operating expenses
Selling, general and administrative expenses	22,107	38,690	75,725	94,463
Research and development expenses	20,450	23,422	64,541	70,618
Total operating expenses	42,557	62,112	140,266	165,081
Operating loss	(7,858)	(19,482)	(35,304)	(46,717)
Interest expense	(4,075)	(4,197)	(12,187)	(12,581)
Foreign currency gain (loss), net	(44,139)	(23,508)	(59,611)	5,510
Other income, net	256	691	1,162	2,156
Loss before income taxes	(55,816)	(46,496)	(105,940)	(51,632)
Income tax expenses	1,250	311	1,781	1,770
Net loss	$ (57,066)	$ (46,807)	$ (107,721)	$ (53,402)
Loss per common share-
Basic	$ (1.65)	$ (1.37)	$ (3.14)	$ (1.57)
Diluted	$ (1.65)	$ (1.37)	$ (3.14)	$ (1.57)
Weighted average number of shares-
Basic	34,664,246	34,056,359	34,273,265	34,055,210
Diluted	34,664,246	34,056,359	34,273,265	34,055,210