Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities
Net (loss) income	$ (14,152)	$ 28,230
Adjustments to reconcile net (loss) income to net cash provided by operating
Depreciation and amortization	7,985	7,834
Deferred income taxes	(10,571)	587
Non-cash equity-based compensation	6,292	7,144
Excess tax benefits from stock option exercises	(461)	(978)
Non-cash items from discontinued operations		(1,285)
Other, net	26
Changes in operating assets and liabilities:
Accounts receivable	18,099	7
Inventories	(4,211)	22,888
Accounts payable	20,912	(7,756)
Accrued expenses, deferred revenue and other current liabilities	(7,095)	(12,476)
Income taxes payable	(1,708)	(1,205)
Other, net	(1,365)	17,286
Net cash provided by operating activities	13,751	60,276
Cash Flows from Investing Activities
Capital expenditures	(5,999)	(16,601)
Proceeds from sales of short-term investments	272,449	99,533
Payments for purchases of short-term investments	(420,767)	(49,014)
Proceeds from sale of assets from discontinued segment		3,758
Other	(718)
Net cash (used in) provided by investing activities	(155,035)	37,676
Cash Flows from Financing Activities
Proceeds from stock option exercises	313	2,161
Restricted stock tax withholdings	(2,335)	(1,330)
Excess tax benefits from stock option exercises	461	978
Repayments of long-term debt	(132)	(121)
Net cash (used in) provided by financing activities	(1,693)	1,688
Effect of exchange rate changes on cash and cash equivalents	(32)	(515)
Net (decrease) increase in cash and cash equivalents	(143,009)	99,125
Cash and cash equivalents at beginning of period	384,557	217,922
Cash and cash equivalents at end of period	241,548	317,047
Non-cash investing and financing activities
Transfers from property, plant and equipment to inventory	2,224
Transfers from inventory to property, plant and equipment	$ 1,144