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Employee Benefit Plans - Share-based Compensation (Details)
12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Equity and Perfomance Incentive Plan 2005 [Member]
Dec. 31, 2011
Prior Plans [Member]
Dec. 31, 2010
Individual Arrangements [Member]
Dec. 31, 2008
Individual Arrangements [Member]
Dec. 31, 2011
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum amount of issued shares   5,900,000 4,400,000      
Effective weight against limit per grant 1.4          
Common stock shares outstanding       850,000 850,000  
Share-based awards issued 5,300,000         224,970
Share-based awards available for grant 2,000,000