For the Three Months Ended June 30,

For the Six Months Ended June 30,

2015

2014

2015

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

—

5,363

—

—

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 ^(a)

—

272,856

—

—

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

(a)

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.