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Stock-Based Compensation Plans and Employee Benefits (401(k) Plan) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Gross contributions made by the Company | $ 0.6 | $ 0.5

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Details
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