Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities
Net income (loss)	$ (4,407)	$ 37,198
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities
Depreciation and amortization	8,958	6,842
Net (gain) loss on disposal of assets	(5)	7
Stock-based compensation	1,484	2,650
Deferred taxes	(5,574)	14,576
Excess tax benefits from stock-based compensation		(4,301)
Changes in operating assets and liabilities:
Accounts receivable	20,199	(10,609)
Inventories	(22,726)	(5,826)
Other inventory supplies	2,006	(5,803)
Prepaid expenses and other assets	1,694	(2,188)
Accounts payable	(5,150)	(2,386)
Accrued payroll	(215)	(434)
Corporate income and franchise taxes	(229)	(154)
Advanced payments	197	(838)
Accrued and other current liabilities	(389)	2,064
Net cash (used in) provided by operating activities	(4,157)	30,798
Cash flows from investing activities
Purchases of property and equipment	(9,390)	(40,656)
Proceeds from disposal of assets	10
Purchases of investments	(202)	(191)
Proceeds from sale of investments	17,300	12,528
Net cash provided by (used in) investing activities	7,718	(28,319)
Cash flows from financing activities
Proceeds from exercise of options	12	741
Restricted cash	18	19
Purchase of treasury stock		(5,482)
Excess tax benefits from stock-based compensation		4,301
Net cash provided by (used in) financing activities	30	(421)
Net effect of currency translation	(280)	226
Net increase in cash and cash equivalents	3,311	2,284
Cash and cash equivalents, beginning of period	4,290	16,073
Cash and cash equivalents, end of period	7,601	18,357
Supplemental disclosures of cash flow information
Cash paid for income taxes		$ 6,050