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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