CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net (loss) income	$ (26,169)	$ 48,150	$ 190,837
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	96,555	66,022	54,658
Stock-based compensation charges	29,225	25,082	17,560
Deferred income tax (benefit) expense	(8,687)	14,600	(74,982)
Recovery of investment	(6,957)	(1,363)	(1,340)
Other	(1,374)	(379)	447
Changes in assets and liabilities, net of assets acquired:
Accounts receivable, net	(3,626)	9,886	(50,899)
Inventories	14,991	(49,416)	(11,253)
Other assets	(33,651)	(3,855)	(13,727)
Current and long-term liabilities	20,756	(8,160)	13,606
Net cash provided by operating activities	81,063	100,567	124,907
Cash flows from investing activities:
Purchase of available-for-sale investments	(73,383)	(80,580)	(59,154)
Maturity / sale of available-for-sale investments	97,081	65,766	78,306
Proceeds from gain/recovery of investment in other companies	6,957	1,363	1,340
Payments for acquisitions	(4,500)	0	0
Other	(175)	(707)	1,195
Capital expenditures	(75,278)	(192,384)	(105,760)
Net cash used in investing activities	(49,298)	(206,542)	(84,073)
Cash flows from financing activities:
Subscription/issuance of common stock, net	18,456	29,548	46,523
Loan commitment fees	0	(200)	(1,638)
Repurchase of common stock	(50,000)	0	0
Excess tax benefit from stock-based compensation arrangements	127	468	3,166
Net cash (used in) provided by financing activities	(31,417)	29,816	48,051
Net increase (decrease) in cash and cash equivalents	348	(76,159)	88,885
Cash and cash equivalents at beginning of period	116,305	192,464	103,579
Cash and cash equivalents at end of period	116,653	116,305	192,464
Supplemental disclosures:
Change in timing of payments related to capital expenditures	(5,916)	(13,804)	19,880
Cash paid for income taxes	$ 39	$ 2,640	$ 725