Condensed 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 income (loss)	$ (43,474)	$ (1,529)	$ (369)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	22,079	16,864	11,922
Impairment of goodwill	29,748	0	0
Inventory valuation allowance	1,928	2,668	1,368
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable	1,531	(842)	0
Deferred tax valuation allowance (reversal)	0	(10,350)	403
Increase (Decrease) in Accrued Taxes Payable	0	0	1,029
Non-cash interest expense	396	420	448
Gain on the liquidation of a foreign subsidiary	0	(2,081)	0
Loss (gain) on disposal of property and equipment	302	143	(462)
Loss on ARS settlement right	0	0	7,833
Gain on ARS	0	0	(7,854)
Stock-based compensation expense	1,391	5,717	6,158
Other	512	1,687	641
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(2,082)	7,146	2,102
Other receivables	1,005	(1,202)	2,043
Inventories	4,168	(9,221)	(1,030)
Inventory deposit	352	(2,249)	(4,068)
Other current assets	744	451	(934)
Accounts payable	3,718	2,629	82
Accrued wages and bonuses	(3,608)	1,317	(536)
Accrued restructuring	(3,014)	2,148	(971)
Deferred income	(2,733)	4,269	998
Other accrued liabilities	(7,352)	(3,177)	(656)
Net cash provided by operating activities	5,611	14,808	16,089
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	(79,298)	(3,385)
Proceeds from sale of auction rate securities	0	0	62,175
Capital expenditures	(11,092)	(8,171)	(4,061)
Purchase of long-term assets	(368)	(500)	(3,758)
Other	300	0	477
Net cash provided by (used in) investing activities	(11,160)	(87,969)	51,448
Cash flows from financing activities:
Borrowings on line of credit	0	0	13,738
Payments on line of credit	0	0	(55,025)
Repurchase of convertible notes	(10,081)	(4,875)	0
Repurchases of common stock	0	(3,920)	0
Proceeds from issuance of common stock	1,272	1,646	2,586
Other financing activities	(213)	(923)	(469)
Net cash used in financing activities	(9,022)	(8,072)	(39,170)
Effect of exchange rate changes on cash	(17)	(75)	39
Net increase (decrease) in cash and cash equivalents	(14,588)	(81,308)	28,406
Cash and cash equivalents, beginning of period	47,770	129,078	100,672
Cash and cash equivalents, end of period	33,182	47,770	129,078
Supplemental disclosure of cash flow information:
Interest	1,347	1,424	1,375
Income taxes	1,202	806	592
Supplemental disclosure of non-cash investing and financing activities:
Issuance of common stock for acquisitions	0	30,818	0
Common stock issued pursuant to benefit plans	$ 0	$ 314	$ 0