Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 72,672	$ 102,434
Accounts receivable, net	67,780	72,957
Inventories, net	71,800	75,334
Other receivables	5,450	10,616
Prepaid expenses	7,142	7,560
Current deferred income tax assets	43	237
Hedge collateral	6,380
Other current assets	7,383	6,898
Total current assets	238,650	276,036
Property, plant and equipment, net	208,351	223,766
Intangible assets, net	2,476	2,451
Long-term prepaid expenses	9,875	10,916
Deferred income tax assets	260	415
Other non-current assets	12,876	14,147
Total assets	472,488	527,731
Current liabilities
Accounts payable	57,432	70,767
Other accounts payable	9,724	10,986
Accrued expenses	75,556	81,060
Other current liabilities	5,946	6,460
Total current liabilities	148,658	169,273
Long-term borrowings, net	224,095	224,035
Accrued severance benefits, net	143,727	139,289
Other non-current liabilities	10,703	13,636
Total liabilities	$ 527,183	$ 546,233
Commitments and Contingencies (Note 16)
Stockholders' equity
Common stock, $0.01 par value, 150,000,000 shares authorized, 40,840,685 shares issued and 34,261,920 outstanding at June 30, 2015 and 40,635,233 shares issued and 34,056,468 outstanding at December 31, 2014	$ 408	$ 406
Additional paid-in capital	121,602	118,419
Accumulated deficit	(61,998)	(11,343)
Treasury stock, 6,578,765 shares at June 30, 2015 and December 31, 2014	(90,918)	(90,918)
Accumulated other comprehensive loss	(23,789)	(35,066)
Total stockholders' equity (deficit)	(54,695)	(18,502)
Total liabilities and stockholders' equity	$ 472,488	$ 527,731