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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 6 Months Ended 142 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Asbestos [Member]
Claim
Jun. 30, 2013
Asbestos [Member]
Claim
Jun. 30, 2013
Asbestos [Member]
Minimum [Member]
Jun. 30, 2013
Asbestos [Member]
Maximum [Member]
Loss Contingencies [Line Items]                
Pending claims, approximate number         2,230 2,230    
Amount paid for settled claim           $ 14,400,000    
Range of possible loss, minimum         27,100,000 27,100,000    
Range of possible loss, maximum         41,500,000 41,500,000    
Increase for low end of range         400,000      
Decrease for high end of range         25,000,000      
Incremental provision for asbestos accrual         400,000      
Asbestos liability reserve         27,100,000 27,100,000    
Estimated legal costs             32,300,000 57,000,000
Changes in product warranties [Roll forward]                
Balance, beginning of period 19,414,000 13,948,000 17,288,000 13,500,000        
Liabilities accrued for current year sales 22,020,000 20,233,000 40,376,000 35,656,000        
Settlement of warranty claims (17,936,000) (15,332,000) (34,166,000) (30,307,000)        
Balance, end of period $ 23,498,000 $ 18,849,000 $ 23,498,000 $ 18,849,000