Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net income (loss)	$ (4,679)	$ 29,012
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	5,893	4,265
(Gain) loss on disposal of assets	(5)	7
Stock-based compensation	988	1,750
Deferred taxes	(4,903)	(3,329)
Excess tax benefits from stock-based compensation		(10,711)
Changes in operating assets and liabilities:
Accounts receivable	23,328	(12,567)
Inventories	(15,978)	(1,442)
Other inventory supplies	2,077	(3,589)
Prepaid expenses and other assets	2,280	141
Accounts payable	(5,835)	(825)
Accrued payroll	(358)	(888)
Corporate income and franchise taxes	(285)	12,389
Advanced payments	939	(719)
Accrued and other current liabilities	(311)	1,264
Net cash provided by operating activities	3,151	14,758
Cash flows from investing activities
Purchases of property and equipment	(6,371)	(25,385)
Proceeds from disposal of assets	10
Proceeds from sale of investments	20,642	3,113
Net cash provided by (used in) investing activities	14,281	(22,272)
Cash flows from financing activities
Proceeds from exercise of options	4	741
Restricted cash	23	(9)
Excess tax benefits from stock-based compensation		10,711
Net cash provided by financing activities	27	11,443
Net effect of currency translation	25	(29)
Net increase in cash and cash equivalents	17,484	3,900
Cash and cash equivalents, beginning of period	4,290	16,073
Cash and cash equivalents, end of period	21,774	19,973
Supplemental disclosures of cash flow information
Cash paid for income taxes		5,420
Supplemental disclosure of non-cash transactions
Unrealized (gain) loss on investments	$ (42)	$ 18