Commitments and Contingent Liabilites (Narrative) (Details) (USD $)
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9 Months Ended | |
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Sep. 30, 2012
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Dec. 31, 2011
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Product Liability Contingency [Line Items] | ||
Number of railroad ties sold | 1,600,000 | |
Number of replacement ties per defective tie | 1.5 | |
Standard Product Warranty Accrual | $ 28,113,000 | $ 6,632,000 |
Reserve for Concrete Ties [Member]
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Product Liability Contingency [Line Items] | ||
Standard Product Warranty Accrual, Period Increase (Decrease) | 3,000,000 | |
Standard Product Warranty Accrual | 27,200,000 | |
Reserve for Environmental Costs [Member]
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Product Liability Contingency [Line Items] | ||
Estimated Litigation Liability | $ 2,112,000 | $ 2,184,000 |
Five year warranty [Member]
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Product Liability Contingency [Line Items] | ||
Warranty Replacement Ratio | 1.5:1 | |
Fifteen year warranty [Member]
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Product Liability Contingency [Line Items] | ||
Warranty Replacement Ratio | 1:1 |