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Retirement and Security Bonus Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Compensation and Retirement Disclosure [Abstract] |  |  |
401k Employer matching contributions | $ 1.7 |  |
Employer contributions, profit sharing retirement plan | 0.5 | 2.5 | 2.4
Security bonus plan |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Initial vesting percentage | 25.00% |  |
Minimum vesting period | 5 years |  |
Annual vesting percentage after initial period | 5.00% |  |
Expense recognized | $ 2.1 | $ 2.1 | $ 1.9

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