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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 |  |  |  |

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