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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Earning per Share    
Net income available to common stockholders$ 104,185$ 67,629$ 355,624$ 124,499
Effect of assumed conversions    
Net income available to common stockholders and assumed conversions$ 104,185$ 67,629$ 355,624$ 124,499
Average common shares outstanding-basic3,747,3813,689,2453,742,3093,686,312
Dilutive effect of equity instruments2,759,9892,680,5862,758,5102,674,778
Average common shares outstanding-diluted6,507,3706,369,8316,500,8196,361,090
Net income per common share    
Basic$ 0.03$ 0.02$ 0.10$ 0.03
Diluted$ 0.02$ 0.01$ 0.05$ 0.02