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Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
Dec. 17, 2014
Sep. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]      
Accrual for legal matters   $ 6.0 $ 9.0
Estimated environmental matters   $ 5.0 $ 5.0
Judicial Ruling      
Loss Contingencies [Line Items]      
Fines assessed $ 1.6