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Property, Plant and Equipment (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Capital Expenditures Incurred but Not yet Paid $ 3.0us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 1.0us-gaap_CapitalExpendituresIncurredButNotYetPaid  
Property, Plant and Equipment (Textual) [Abstract]      
Depreciation $ 11.0us-gaap_Depreciation $ 11.1us-gaap_Depreciation $ 11.5us-gaap_Depreciation