CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 285	$ 20,453
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,627	7,472
Amortization of intangibles	1,479	486
Gain on sale of property and equipment	(1)	(41)
Stock-based compensation expense	6,673	4,948
Amortization of premium on marketable securities	567	859
Non-cash interest income from SemiSouth note	(780)	0
Deferred income taxes	4,834	826
Provision for (reduction in) accounts receivable allowances	(14)	37
Excess tax benefit from stock options exercised	(474)	(697)
Tax benefit associated with employee stock plans	1,531	1,538
Change in operating assets and liabilities:
Accounts receivable	(5,336)	(2,392)
Inventories	14,119	7,915
Prepaid expenses and other assets	2,834	3,048
Accounts payable	3,795	(4,260)
Taxes payable and accrued liabilities	8,784	1,468
Deferred income on sales to distributors	3,387	(1,021)
Net cash provided by operating activities	49,310	40,639
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(8,754)	(12,519)
Proceeds from sale of property and equipment	2	2,249
Acquisitions	(113,360)	(6,914)
Other assets	0	(808)
Increase in financing lease receivable	(383)	(7,821)
Collections of financing lease receivable	299	205
Loan to SemiSouth	(18,000)	(3,000)
Purchases of marketable securities	0	(11,508)
Proceeds from maturities of marketable securities	12,468	6,630
Net cash used in investing activities	(127,728)	(33,486)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	14,321	14,246
Repurchase of common stock	0	(4,384)
Payments of dividends to stockholders	(2,853)	(2,885)
Excess tax benefit from stock options exercised	474	697
Net cash provided by financing activities	11,942	7,674
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(66,476)	14,827
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	139,836	155,667
CASH AND CASH EQUIVALENTS AT END OF PERIOD	73,360	170,494
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	1,578	3,510
Receipt of SemiSouth purchase option	6,216	0
Acquisition net asset value adjustment (Note 14)	2,358	0
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes, net of refunds	$ 2,076	$ 310