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Commitments and Contingencies (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2011
GBP (£)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Loss Contingencies [Line Items]        
Damages sought, amount $ 8,500 £ 5,500    
Damages sought, interest at statutory rate (per annum) 8.00% 8.00%    
IRS proposed adjustments to tax years 2000 through 2002, before penalty and interest 16,500      
Potential penalty, percentage of tax assessment 20.00% 20.00%    
Leases [Abstract]        
Operating Leases, Rent Expense 19,678   20,179 20,535
Operating Leases, Future Minimum Payments, Due 2012 9,688      
Operating Leases, Future Minimum Payments, Due 2013 8,374      
Operating Leases, Future Minimum Payments, Due 2014 4,614      
Operating Leases, Future Minimum Payments, Due 2015 1,675      
Operating Leases, Future Minimum Payments, Due 2016 1,564      
Operating Leases, Future Minimum Payments, Due Thereafter $ 4,270