CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 48,150	$ 190,837	$ 16,245
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	66,022	54,658	46,942
Stock-based compensation charges	25,082	17,560	14,185
Deferred income tax expense (benefit)	14,600	(74,982)	0
Other	(1,742)	(893)	109
Changes in assets and liabilities, net of assets acquired:
Accounts receivable, net	9,886	(50,899)	(9,498)
Inventories	(49,416)	(11,253)	19,027
Other assets	(3,855)	(13,727)	(9,438)
Accounts payable and accrued expenses	(8,160)	13,606	7,687
Net cash provided by operating activities	100,567	124,907	85,259
Cash flows from investing activities:
Purchase of available-for-sale investments	(80,580)	(59,154)	(77,595)
Maturity/sale of available-for-sale investments	65,766	78,306	78,093
Other	656	2,535	(4,992)
Capital expenditures	(192,384)	(105,760)	(48,557)
Net cash used in investing activities	(206,542)	(84,073)	(53,051)
Cash flows from financing activities:
Subscription/issuance of common stock, net	29,548	46,523	20,473
Loan commitment fees	(200)	(1,638)	0
Excess tax benefit from stock-based compensation arrangements	468	3,166	125
Net cash provided by financing activities	29,816	48,051	20,598
Net (decrease) increase in cash and cash equivalents	(76,159)	88,885	52,806
Cash and cash equivalents at beginning of period	192,464	103,579	50,773
Cash and cash equivalents at end of period	116,305	192,464	103,579
Supplemental disclosures:
Change in timing of payments related to capital expenditures	(13,804)	19,880	2,074
Cash paid for income taxes	$ 2,640	$ 725	$ 653