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Acquisitions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |
Payments for Previous Acquisition | $ 495 |
L.B. Foster Ball Winch, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Name of Acquired Entity |  | Ball Winch, LLC (Ball Winch).
Payments to Acquire Businesses, Net of Cash Acquired |  | 37,500
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  | 3,300
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | 37,995
Payments for Previous Acquisition | $ 495 |

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