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Commitments and Contingencies (Details) (USD $)
3 Months Ended
Mar. 31, 2013
item
Commitments and Contingencies  
Amount of reasonable estimate of liability 0
Gaskets mislabeled as being non-asbestos
 
Commitments and Contingencies  
Number of gaskets bought, that might have been mislabeled 43,000
Surety | Minimum
 
Surety  
Percentage of business which has required bonds 25.00%
Surety | Maximum
 
Surety  
Percentage of business which has required bonds 35.00%