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Commitments and Contingent Liabilities (Environmental Liability) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Commitments and Contingent Liabilities [Abstract]  
Environmental liability, beginning balance $ 3,344
Additions to environmental obligations 46
Environmental obligations utilized (160)
Acquisitions 3,460
Environmental liability, ending balance $ 6,690