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Warranties (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Warranties [Abstract]      
Beginning balance $ 423 $ 624 $ 289
Warranty provisions 234 198 484
Warranty claims (233) (318) (149)
Adjustments to preexisting warranties 96 (81)  
Ending balance $ 520 $ 423 $ 624