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Stock-Based Compensation Plans and Employee Benefits (401(k) Plan) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Gross contributions made by the Company $ 0.1 $ 0.1 $ 0.7 $ 0.7