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Warranty Contracts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Warranty Contracts [Line Items]      
Deferred warranty revenue beginning balance $ 4,081 $ 3,094 $ 4,433
Warranty revenue deferred 14,681 7,540 4,210
Warranty revenue recognized (9,621) (6,553) (5,549)
Deferred warranty revenue ending balance 9,141 4,081 3,094
Warranty Costs Incurred 9,262 6,392 5,585
Product Warranty Period 1 year    
Materials [Member]
      
Warranty Contracts [Line Items]      
Warranty Costs Incurred 4,441 2,672 2,020
Labor And Overhead [Member]
      
Warranty Contracts [Line Items]      
Warranty Costs Incurred $ 4,821 $ 3,720 $ 3,565