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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator:        
Net income $ 119,961 $ 125,522 $ 213,949 $ 249,124
Less:        
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 0 0 0 (4,979)
Net income available to common stockholders for basic net income per common share 119,961 125,522 213,949 244,145
Add back:        
Allocation of undistributed income to Series B Preferred Stock 0 0 0 4,979
Effect of interest on assumed conversions of convertible debt 5,363 0 0 0
Net income available to common stockholders for diluted net income per common share $ 125,324 $ 125,522 $ 213,949 $ 249,124
Denominator:        
Weighted average common shares outstanding for basic net income per common share (in shares) 5,865,032 6,354,755 5,979,273 6,307,541
Weighted average impact of assumed Series B Preferred Stock conversion (in shares) 0 0 0 128,636
Weighted average impact of assumed convertible debt (in shares) 272,856 0 0 0
Weighted average impact of other dilutive equity instruments (in shares) 72,190 92,762 75,498 90,521
Weighted average shares for diluted net income per common share (in shares) 6,210,078 6,447,517 6,054,771 6,526,698
Net income per common share:        
Basic (in dollars per share) $ 0.02 $ 0.02 $ 0.04 $ 0.04
Diluted (in dollars per share) $ 0.02 $ 0.02 $ 0.04 $ 0.04