Commitments and Contingencies (Details) (USD $)	3 Months Ended			139 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Asbestos [Member] Case	Mar. 31, 2013 Asbestos [Member] Case	Mar. 31, 2013 Asbestos [Member] Minimum [Member]	Mar. 31, 2013 Asbestos [Member] Maximum [Member]
Loss Contingencies [Line Items]
Pending claims, approximate number			2,160	2,160
Amount paid for settled claim				$ 14,000,000
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	17,288,000	13,500,000
Liabilities accrued for current year sales	18,356,000	15,423,000
Settlement of warranty claims	(16,230,000)	(14,975,000)
Balance, end of period	$ 19,414,000	$ 13,948,000