Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share - Earnings per Share (Details)

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Earnings per Share - Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income available to common stockholders for basic net income per common share $ 102,849 $ 119,961 $ 208,541 $ 213,949
Add back:        
Effect of interest on assumed conversions of convertible debt 0 5,363 0 0
Net income available to common stockholders for diluted net income per common share $ 102,849 $ 125,324 $ 208,541 $ 213,949
Denominator:        
Weighted average common shares outstanding for basic net income per common share 5,443,590 5,865,032 5,506,818 5,979,273
Weighted average impact of assumed convertible debt [1] 0 272,856 0 0
Weighted average impact of dilutive equity instruments 64,011 72,190 63,627 75,498
Weighted average shares for diluted net income per common share 5,507,601 6,210,078 5,570,445 6,054,771
Net income per common share:        
Basic $ 0.02 $ 0.02 $ 0.04 $ 0.04
Diluted $ 0.02 $ 0.02 $ 0.04 $ 0.04
[1] During the six months ended June 30, 2014, 272,856 shares of common stock were reserved for conversion in connection with the 7% Exchangeable Senior Subordinated Notes due 2014 (the “Exchangeable Notes”) and were considered to be anti-dilutive in our calculation of diluted net income per share. The Exchangeable Notes were fully converted into shares of our common stock as of December 1, 2014.