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Restructuring Charges (Details Textual) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
2011 Severance Costs [Member]
Sep. 30, 2011
2007 Facility Consolidation and Severance Costs [Member]
Buildings
Dec. 31, 2007
2007 Facility Consolidation and Severance Costs [Member]
Jun. 30, 2012
2007 Facility Consolidation and Severance Costs [Member]
Buildings
Mar. 31, 2012
2007 Facility Consolidation and Severance Costs [Member]
Dec. 31, 2011
2007 Facility Consolidation and Severance Costs [Member]
Restructuring Charges (Textual) [Abstract]              
Restructuring charges       $ 17.1      
Unoccupied building     4,100        
Occupied building         4,300    
Space remittance fee           5.0  
Tenant improvements         1.2    
Reduction of facility consolidation restructuring reserve related to 4100 building amendment             2.0
Severance charges   $ 1.9          
Lease expiration date Jan. 31, 2019