CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 41,229	$ (44,121)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	12,062	11,426
Amortization of intangibles	5,526	3,322
Charge related to SemiSouth (Note 15)	0	59,237
Loss (gain) on sale of property and equipment	17	(1)
Gain on sale of assets held for sale	(497)	0
Stock-based compensation expense	12,155	10,520
Amortization of premium on marketable securities	472	738
Non-cash interest income from SemiSouth note	0	(1,445)
Deferred income taxes	(4,806)	4,089
(Reduction in) provision for accounts receivable allowances	(127)	21
Excess tax benefit from stock options exercised	0	(560)
Tax benefit associated with employee stock plans	0	1,413
Change in operating assets and liabilities:
Accounts receivable	(7,648)	1,489
Inventories	4,359	15,745
Prepaid expenses and other assets	1,595	(11,335)
Accounts payable	2,952	4,842
Taxes payable and accrued liabilities	2,608	(28,255)
Deferred income on sales to distributors	5,311	2,554
Net cash provided by operating activities	75,208	29,679
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(11,250)	(12,181)
Proceeds from sale of property and equipment	36	2
Proceeds from sale of assets held for sale	959	0
Acquisition	0	(115,720)
Increase in financing lease receivable	0	(420)
Collections of financing lease receivable	0	527
Loan to SemiSouth	0	(18,000)
Purchases of marketable securities	(96,271)	0
Proceeds from maturities of marketable securities	25,450	36,788
Net cash used in investing activities	(81,076)	(109,004)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	27,638	17,977
Payments of dividends to stockholders	(7,046)	(4,301)
Excess tax benefit from stock options exercised	0	560
Net cash provided by financing activities	20,592	14,236
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	14,724	(65,089)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	63,394	139,836
CASH AND CASH EQUIVALENTS AT END OF PERIOD	78,118	74,747
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	1,871	1,478
Receipt of SemiSouth purchase option	0	6,216
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash (received) paid for income taxes, net of refunds	$ (569)	$ 45,108