Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net loss	$ (50,655)	$ (6,595)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	13,667	15,022
Provision for severance benefits	11,877	9,426
Bad debt expenses (reversal of allowance)	(3)	3,724
Amortization of debt issuance costs and original issue discount	324	301
Loss (gain) on foreign currency, net	17,146	(31,969)
Gain on disposal of investments		(1,524)
Stock-based compensation	1,977	1,072
Other	1,547	758
Changes in operating assets and liabilities
Accounts receivable	3,145	6,712
Inventories, net	1,623	(11,537)
Other receivables	5,523	781
Other current assets	2,235	4,590
Deferred tax assets	339	391
Accounts payable	(12,431)	4,556
Other accounts payable	(5,550)	(8,560)
Accrued expenses	(10,710)	20,260
Other current liabilities	(2,058)	1,230
Other non-current liabilities	(1,084)	292
Payment of severance benefits	(4,231)	(3,490)
Other	(147)	13
Net cash provided by (used in) operating activities	(27,466)	5,453
Cash flows from investing activities
Payment of hedge collateral	(6,555)
Proceeds from disposal of investments		2,003
Purchase of plant, property and equipment	(1,964)	(12,058)
Payment for intellectual property registration	(263)	(490)
Payment of guarantee deposits	(642)	(308)
Other	237	39
Net cash used in investing activities	(9,187)	(10,814)
Cash flows from financing activities
Proceeds from issuance of common stock	1,208	67
Net cash provided by financing activities	1,208	67
Effect of exchange rates on cash and cash equivalents	5,683	(7,315)
Net decrease in cash and cash equivalents	(29,762)	(12,609)
Cash and cash equivalents
Beginning of the period	102,434	153,606
End of the period	72,672	140,997
Supplemental cash flow information
Cash paid for interest	7,683	7,354
Cash paid for income taxes	388	706
Non-cash investing activities
Property, plant and equipment additions in other accounts payable	$ 1,493	$ 1,436