Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share (Details)

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Earnings per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Numerator:    
Net income $ 123,602 $ 107,774
Less:    
Allocation of undistributed income to Series B Preferred Stock (4,905) (43,876)
Net income available to common stockholders for basic net income per common share 118,697 63,898
Add back:    
Allocation of undistributed income to Series B Preferred Stock 4,905 43,876
Net income available to common stockholders for diluted net income per common share $ 123,602 $ 107,774
Denominator:    
Weighted average common shares outstanding for basic net income per common share 6,259,803 3,767,443
Weighted average impact of assumed Series B Preferred Stock conversion 258,702 2,586,977
Weighted average impact of other dilutive equity instruments 87,771 183,308
Weighted average shares for diluted net income per common share 6,606,276 6,537,728
Net income per common share:    
Basic (in dollars per share) $ 0.02 $ 0.02
Diluted (in dollars per share) $ 0.02 $ 0.02