Consolidated statements of cash flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities
Net loss	$ (15,110)	$ (4,407)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	9,355	8,958
Net loss (gain) on disposal of assets	556	(5)
Stock-based compensation	1,230	1,484
Deferred taxes	(11,302)	(5,574)
Changes in operating assets and liabilities:
Accounts receivable	8,226	20,199
Inventories	7,806	(22,726)
Other inventory supplies	3,106	2,006
Prepaid expenses and other assets	2,018	1,694
Accounts payable	(4,064)	(5,150)
Accrued payroll	(599)	(215)
Corporate income and franchise taxes	(46)	(229)
Advanced payments	(492)	197
Accrued and other current liabilities	(577)	(389)
Net cash provided by (used in) operating activities	107	(4,157)
Cash flows from investing activities
Purchases of property and equipment	(7,312)	(9,390)
Proceeds from disposal of assets	135	10
Purchases of investments	(2,030)	(202)
Proceeds from sale of investments	10,337	17,300
Net cash provided by investing activities	1,130	7,718
Cash flows from financing activities
Proceeds from exercise of options	140	12
Restricted cash	6	18
Net cash provided by financing activities	146	30
Net effect of currency translation	622	(280)
Net increase in cash and cash equivalents	2,005	3,311
Cash and cash equivalents, beginning of period	19,573	4,290
Cash and cash equivalents, end of period	$ 21,578	$ 7,601