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:
Consolidated net income (loss)	$ 19,578	$ 29,001	$ (639)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	13,676	15,267	15,653
Provision for inventory	4,472	6,646	6,361
Share-based compensation	4,580	3,276	1,871
Deferred income taxes	(14,979)	78	5,553
Earnings from equity investment	(556)	(1,171)	(857)
Gain on disposal of business	(2,255)
Gain on sale of auction rate securities			(988)
Non-cash interest expense	1,049	1,881	976
Non-cash restructuring charges	3,825	1,163	72
Other	(50)	199	(456)
Changes in operating assets and liabilities:
Accounts receivable	2,261	4,822	(7,727)
Inventories	(4,361)	(6,062)	(8,171)
Deferred cost of goods sold	1,522	5,791	22,281
Income taxes receivable, prepaid expenses, and other current assets	6,545	(837)	2,169
Deferred revenue	(4,133)	(9,343)	(40,347)
Long-term taxes payable	(6,293)	1,413	556
Accounts payable, short-term income taxes payable, accrued expenses, and other current liabilities	3,783	(5,898)	222
Other non-current assets and liabilities	(234)	(1,053)	(1,267)
Cash provided by (used in) operating activities	28,430	45,173	(4,738)
Cash flows from investing activities:
Purchases of property, plant and equipment	(4,308)	(4,217)	(2,659)
Proceeds from the sale of auction rate securities			11,408
Proceeds from sale of business	7,000
Proceeds from the sale of property, plant and equipment	283
Cash used in (provided by) investing activities	2,975	(4,217)	8,749
Cash flows from financing activities:
Repayments of long-term debt and revolving credit facility	(23,000)	(113,214)	(74,889)
Proceeds from term loan and revolving credit facility	5,000	73,107
Payments for debt issuance costs	(1,826)	(2,988)	(1,565)
Payments of withholding taxes from stock-based awards	(543)
Excess tax benefits from stock-based awards	36
Capital lease payments	(779)
Proceeds from Rights Offering			64,889
Cash used in financing activities	(21,112)	(43,095)	(11,565)
Effect of exchange rates on cash and cash equivalents	660	193	1,007
Increase (decrease) in cash and cash equivalents	10,953	(1,946)	(6,547)
Cash and cash equivalents, beginning of year	54,835	56,781	63,328
Cash and cash equivalents, end of year	65,788	54,835	56,781
Supplemental disclosure of cash flow information:
Cash paid for interest	2,067	12,464	25,899
Cash paid for income taxes	3,440	1,912	2,145
Income tax refunds received	222	25	2,053
Cash paid for reorganization items			26,686
Supplemental disclosure of non cash investing activity:
Accrual for capital expenditures	925	362
Supplemental disclosure of non cash financing activity:
Exchange of debt for common shares			28,071
Issuance of PIK notes		532	535
Assets acquired under capital lease obligation		$ 2,214