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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income $ 125,522 $ 3,134,170 $ 249,124 $ 3,241,944
Less:        
Allocation of undistributed income to Series B Preferred Stock 0 (1,276,342) (4,979) (1,320,037)
Net income available to common stockholders for basic net income per common share 125,522 1,857,828 244,145 1,921,907
Add back:        
Allocation of undistributed income to Series B Preferred Stock 0 1,276,342 4,979 1,320,037
Net income available to common stockholders for diluted net income per common share $ 125,522 $ 3,134,170 $ 249,124 $ 3,241,944
Denominator:        
Weighted average common shares outstanding for basic net income per common share (in shares) 6,354,755 3,765,573 6,307,541 3,766,508
Weighted average impact of assumed Series B Preferred Stock conversion (in shares) 0 2,586,977 128,636 2,586,977
Weighted average impact of other dilutive equity instruments (in shares) 92,762 153,609 90,521 168,129
Weighted average shares for diluted net income per common share (in shares) 6,447,517 6,506,159 6,526,698 6,521,614
Net income per common share:        
Basic (in dollars per share) $ 0.02 $ 0.49 $ 0.04 $ 0.51
Diluted (in dollars per share) $ 0.02 $ 0.48 $ 0.04 $ 0.50