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Income Taxes (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Inventory valuation $ 6,983,000 $ 6,386,000
Domestic net operating loss carry forwards 5,585,000 1,144,000
Tax credit carry forwards 12,566,000 4,145,000
Foreign net operating loss carry forwards 821,000  
Warranty and installation accruals 3,002,000 2,174,000
Equity compensation 10,638,000 9,114,000
Other accruals 2,556,000 3,270,000
Other 1,160,000 760,000
Total deferred tax assets 43,311,000 26,993,000
Valuation allowance (7,753,000) (4,708,000)
Net deferred tax assets 35,558,000 22,285,000
Deferred tax liabilities:    
Purchased intangible assets 45,208,000 9,973,000
Undistributed earnings 1,737,000 1,095,000
Depreciation 4,711,000 7,014,000
Total deferred tax liabilities 51,656,000 18,082,000
Net deferred taxes (16,098,000) 4,203,000
Provision on withholding taxes of undistributed earnings of foreign subsidiaries 0  
Undistributed earnings of foreign subsidiaries 101,000,000  
Foreign tax credit carry forward expiration period between 2022 and 2023 12,600,000  
Valuation allowance    
Increase in valuation allowance 3,000,000  
State and local
    
Valuation allowance    
Increase in valuation allowance 1,600,000  
Foreign tax
    
Valuation allowance    
Increase in valuation allowance $ 1,400,000