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Summary of Significant Accounting Policies (Stock-Based Compensation Plans) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award
Allocated Share-based Compensation Expense	$ 1.3	$ 1.5	$ 1.4
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	700,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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