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Income Taxes (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:    
Inventory valuation $ 5,468,000 $ 8,999,000
Domestic net operating loss carry forwards 1,082,000 1,219,000
Tax credit carry forwards 3,015,000 9,961,000
Foreign net operating loss carry forwards 89,000 147,000
Warranty and installation accruals 3,044,000 2,742,000
Equity compensation 5,821,000 3,655,000
Other accruals 2,373,000 2,063,000
Depreciation   1,325,000
Other 1,636,000 1,890,000
Total deferred tax assets 22,528,000 32,001,000
Valuation allowance (1,765,000) (1,644,000)
Net deferred tax assets 20,763,000 30,357,000
Deferred tax liabilities:    
Purchased intangible assets 9,818,000 4,854,000
Convertible debt discount   1,663,000
Undistributed earnings 974,000 370,000
Depreciation 4,115,000  
Other   264,000
Total deferred tax liabilities 14,907,000 7,151,000
Net deferred taxes 5,856,000 23,206,000
Undistributed earnings of foreign subsidiaries 72,500,000  
Increase in valuation allowance $ 100,000