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Commitments and Contingencies - Range of Estimated Loss and Number of Active Sites (Details) (USD $)
Sep. 30, 2014
Site
Dec. 31, 2013
Site
Range of Estimated Loss and Number of Active Sites for Environmental Matters:    
Low-end range $ 3,000,000 $ 3,000,000
High-end range $ 30,000,000 $ 6,000,000
Number of active environmental investigation and remediation sites 28 5