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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator:        
Net income $ 136,170 $ 62,894 $ 350,119 $ 312,018
Less:        
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 0 0 0 (4,190)
Net income available to common stockholders for basic net income per common share 136,170 62,894 350,119 307,828
Add back:        
Allocation of undistributed income to Series B Preferred Stock 0 0 0 4,190
Effect of interest on assumed conversions of convertible debt 5,363 0 16,088 0
Net income available to common stockholders for diluted net income per common share $ 141,533 $ 62,894 $ 366,207 $ 312,018
Denominator:        
Weighted average common shares outstanding for basic net income per common share (in shares) 5,626,078 6,184,216 5,860,248 6,265,981
Weighted average impact of assumed Series B Preferred Stock conversion (in shares) 0 0 0 85,286
Weighted average impact of assumed convertible debt (in shares) 272,853 0 272,853 0
Weighted average impact of other dilutive equity instruments (in shares) 75,116 103,137 75,468 94,815
Weighted average shares for diluted net income per common share (in shares) 5,974,047 6,287,353 6,208,569 6,446,082
Net income per common share:        
Basic (in dollars per share) $ 0.02 $ 0.01 $ 0.06 $ 0.05
Diluted (in dollars per share) $ 0.02 $ 0.01 $ 0.06 $ 0.05