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Employee Benefit and Equity Plans (Details Textuals) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Year
FinancialInstitution
CreditFacility
Project
Well
CommercialBank
Sep. 30, 2010
Dec. 31, 2010
Employee Benefit and Equity Plans (Textuals) [Abstract]     
Weighted average grant date fair value of SARs granted  $ 18.21  
Risk-free interest rate  1.40%  
Dividend yield  0.30%  
Expected volatility  47.00%  
Expected life in years  3.6  
Number of stock option and SARs outstanding5,036,782 5,036,782 6,461,839
Number of stock option outstanding647,000 647,000  
Number of SARs outstanding4,400,000 4,400,000  
Average price of shares granted to employees  $ 51.11$ 45.85 
Vesting period of shares granted to employeesP3Y P3Y  
Non-cash, Mark-to-market income (loss) related to deferred compensation plan8,700,0005,300,00033,600,00025,200,000 
Vesting period of RSUs  3 years  
Average price of shares granted to directors  $ 52.35$ 45.51 
Employee [Member]
     
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]     
Shares granted  334,200392,000 
Director [Member]
     
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]     
Shares granted  15,50021,000