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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 245 $ 228 $ 741
Additions Charged to Operations 439 41 141
Deductions from Reserves 57 24 654
Balance at End of Year 627 245 228
Warranty [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 1,525 2,279 3,039
Additions Charged to Operations 6,261 2,642 1,350
Deductions from Reserves 5,457 3,396 2,110
Balance at End of Year 2,329 1,525 2,279
Deferred Tax Asset Valuation Allowance [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 36,395 21,783 3,897
Additions Charged to Operations 27,486 14,612 22,724
Deductions from Reserves 0 0 4,838
Balance at End of Year 63,881 36,395 21,783
Sales Returns Allowance [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 545 346 303
Additions Charged to Operations 497 911 188
Deductions from Reserves 131 712 145
Balance at End of Year $ 911 $ 545 $ 346