Income Taxes Deferred Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	$ 1,136	$ 1,167
Deferred Tax Assets, Inventory	1,734	2,904
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges	119	1,331
Deferred Tax Assets, Operating Loss Carryforwards	40,547	34,245
Deferred Tax Assets, Tax Credit Carryforwards	25,256	26,296
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	2,696	4,261
Deferred Tax Assets, in Process Research and Development	556	1,241
Deferred Tax Assets, Property, Plant and Equipment	2,179	2,783
Deferred Tax Assets, Goodwill and Intangible Assets	4,464	4,626
Deferred Tax Assets, Other	5,723	7,307
Deferred Tax Assets, Gross	84,410	86,161
Deferred Tax Assets, Valuation Allowance	(50,200)	(46,428)
Deferred Tax Assets, Net of Valuation Allowance	34,210	39,733
Deferred Tax Liabilities, Intangible Assets	(17,286)	(21,721)
Deferred Tax Liabilities, Other	(387)	(239)
Deferred Tax Liabilities, Net	(17,673)	(21,960)
Deferred Tax Assets, Net	$ 16,537	$ 17,773