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Property and Equipment - Textual (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2008
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Property and Equipment (Textual) [Abstract]        
Corporate Campus Sale Proceeds $ 43.5      
Percentage of Net Profit Company is Entitled to Under Sale Agreement 40.00%      
Operating Lease Term, Minimum   3    
Operating Lease Term, Maximum   15    
Rental Income from Subleases   4.7 4.4 4.9
Total Expected Future Minimum Sublease Rental Income   14.9    
Number of sale/leaseback transactions   2    
Sale/Leaseback Transactions, Future Minimum Payments, 2012   2.7    
Sale/Leaseback Transactions, Future Minimum Payments, 2013   2.7    
Sale/Leaseback Transactions, Future Minimum Payments, 2014   2.7    
Sale/Leaseback Transactions, Future Minimum Payments, 2015   2.7    
Sale/Leaseback Transactions, Future Minimum Payments, 2016   2.7    
Sale/Leaseback Transactions, Future Minimum Payments, 2017 & Thereafter   $ 19.4