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Summary of Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Accrued exit costs [Member]
Dec. 31, 2010
Severance payments [Member]
Dec. 31, 2009
Severance payments [Member]
Dec. 31, 2010
Future Lease Payments Lease Terminated [Member]
Dec. 31, 2009
Future lease payments net of estimated sublease rentals [Member]
Dec. 31, 2010
Leasehold improvements and other [Member]
Dec. 31, 2009
Leasehold improvements and other [Member]
Summary of exit activities                  
Accrued Exit Costs, Beginning Balance $ 832 $ 0 $ 64 $ 503 $ 0 $ 288 $ 0 $ 41 $ 0
Exit Costs 258 1,218      615 107 288 151 315
Payments to Date (1,026) (386) (64) (503) (112) (395)   (128) (274)
Accrued Exit Costs, Ending Balance $ 64 $ 832 $ 0 $ 0 $ 503 $ 0 $ 288 $ 64 $ 41