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Balance Sheet Information (Details 3) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Changes in warranty liability    
Balance as of the beginning of period $ 8,731 $ 8,266
Warranties issued during the period 2,486 5,988
Settlements made during the period (6,389) (6,523)
Changes in estimate during the period 1,418 1,259
Balance as of the end of period 6,246 8,990
Accrued warranty reclassified to accrued installation $ 1,047 $ 972