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Commitments and Contingent Liabilites (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2012
Product Liability Contingency [Line Items] |  |  |  |  |
Standard Product Warranty Accrual | $ 10,154 | $ 10,154 | $ 8,755 |  |
Accrual for Environmental Loss Contingencies | 6,270 | 6,270 | 6,640 |  |
Reserve for Concrete Ties [Member] |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  | $ 12,000
Product Warranty Expense |  | 204 | 972 | $ 9,854 | $ 22,000
Standard Product Warranty Accrual | 7,574 | $ 7,574 | $ 7,544 |  |
Collective Action Complaint [Member] |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |
Litigation Settlement, Amount | 900 |  |  |  |
Transit Products [Member] |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |
Product Warranty Expense | $ 1,224 |  |  |  |

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- Definition The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3,4)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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