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Commitments and Contingent Liabilites (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Standard Product Warranty Accrual | $ 7,483 |  |  |  | $ 15,727 |  |  |  |  |  | $ 7,483 | $ 15,727 | $ 6,632
Sales Revenue, Goods, Net | 156,458 | 162,248 | 149,936 | 129,321 | 140,724 | 170,346 | [1] | 163,180 | [2] | 114,291 | 597,963 | 588,541 | 575,337
Property, Plant and Equipment, Net | 50,109 |  |  |  | 42,333 |  |  |  |  |  | 50,109 | 42,333 |
Accrual for Environmental Loss Contingencies | 2,190 |  |  |  | 2,141 |  |  |  |  |  | 2,190 | 2,141 |
Reserve for Concrete Ties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  |  |  |  |  |  | 12,000 |  |
Product Warranty Expense |  |  |  |  |  |  |  |  |  |  |  | 22,000 |
Standard Product Warranty Accrual | 6,462 |  |  |  | 14,837 |  |  |  |  |  | 6,462 | 14,837 |
Standard Product Warranty Accrual, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  | 612 | 23,019 | 3,469
The UPRR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Goods, Net |  |  |  |  |  |  |  |  |  |  | 12,664 | 25,441 | 22,395
Property, Plant and Equipment, Net | $ 1,116 |  |  |  |  |  |  |  |  |  | $ 1,116 |  |
[1] | Includes a pre-tax loss of approximately $315 from the Company’s sale of Precise.
[2] | Includes a pre-tax gain of approximately $3,508 from the Company’s sale of SSD.

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