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Warranties (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance, beginning of period $ 7,352 $ 5,776
Payments made (893) (733)
Provisions 989 847
Balance, end of period 7,448 5,890
Warranty expense $ 989 $ 847