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Summary of Significant Accounting Policies (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Warranty activity |  |  |
Warranty reserves, beginning of the year | $ 5,596,000 | $ 5,037,000 | $ 4,078,000
Accruals for warranties issued during the year | 7,935,000 | 4,003,000 | 4,399,000
Reductions related to pre-existing warranties | (2,401,000) | (1,769,000) | (1,447,000)
Warranties paid | (1,958,000) | (1,677,000) | (2,054,000)
Other (principally foreign currency translation) | (80,000) | 2,000 | 61,000
Warranty reserves, beginning of the year | 9,092,000 | 5,596,000 | 5,037,000
Self-insurance |  |  |
Loss Contingencies [Line Items] |  |  |
Insurance expense from continuing operations | 33,800,000 | 37,000,000 | 38,500,000
Decrease in pre-tax insurance expense due to retrospective insurance reserve adjustments from continuing operations | 4,300,000 | 2,700,000 | 2,500,000
Liabilities for asserted and unasserted claims | 82,700,000 | 85,900,000 |
Liabilities covered by insurance carriers | $ 3,600,000 | $ 2,600,000 |

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