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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Benefit Plans [Abstract]      
Defined contribution plan, employer matching contribution, percent 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Defined contribution plan, employers matching contribution, vesting percentage 100.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage    
Employer contributions to the 401(k) plan $ 1.1us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0.9us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0.9us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined benefit plan, assets 6.4us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent    
Defined benefit pension plan, liabilities 6.0us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities    
Funded status of plan on balance sheet $ 0.4us-gaap_DefinedBenefitPlanFundedStatusOfPlan $ 0.3us-gaap_DefinedBenefitPlanFundedStatusOfPlan