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Income Taxes Components of Deferred Tax asset/ liability (Textual) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Components of deferred tax assets and liabilities [Line Items]  
Undistributed Earnings of Foreign Subsidiaries $ 10.8us-gaap_UndistributedEarningsOfForeignSubsidiaries
State and Local Jurisdiction [Member]  
Components of deferred tax assets and liabilities [Line Items]  
Operating Loss Carryforwards 101.0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]  
Components of deferred tax assets and liabilities [Line Items]  
Tax Credit Carryforward, Amount 15.4us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember
Domestic Tax Authority [Member]  
Components of deferred tax assets and liabilities [Line Items]  
Operating Loss Carryforwards 228.9us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Operating Loss Carryforwards, Expiration Dates Dec. 31, 2034
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]  
Components of deferred tax assets and liabilities [Line Items]  
Tax Credit Carryforward, Amount $ 11.0us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember
Tax Credit Carryforward, Expiration Date Dec. 31, 2034