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Stock-Based Compensation Plans and Employee Benefits (401(k) Plan) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Gross contributions made by the Company $ 0.6us-gaap_DefinedContributionPlanCostRecognized $ 0.6us-gaap_DefinedContributionPlanCostRecognized