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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share
The following table summarizes the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computations:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Weighted average common shares issued
105,563,455

 
105,563,455

 
105,563,455

 
105,563,455

Average treasury stock shares
(16,445,760
)
 
(11,584,636
)
 
(15,480,232
)
 
(11,232,622
)
Average unearned nonvested shares
(195,303
)
 
(184,230
)
 
(189,561
)
 
(163,897
)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share
88,922,392

 
93,794,589

 
89,893,662

 
94,166,936

Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share
16,611

 
16,954

 
9,888

 
10,895

Additional common stock equivalents (stock options) used to calculate diluted earnings per share
—

 
—

 
—

 
—

Weighted average common shares and common stock equivalents used to calculate diluted earnings per share
88,939,003

 
93,811,543

 
89,903,550

 
94,177,831
Common Stock Equivalents Not Included in Computation of Diluted Earnings Per Share
The following table shows the number of shares and the price per share related to common stock equivalents that were not included in the computation of diluted earnings per share for the six months ended June 30 because to do so would have been antidilutive.
 
2015
 
2014
 
 
 
Price Range
 
 
 
Price Range
 
Shares
 
From
 
To
 
Shares
 
From
 
To
Stock Options
—

 
$
—

 
$
—

 
15,000

 
$
14.55

 
$
14.55

Restricted Stock
146,933

 
5.26

 
9.26

 
93,268

 
5.96

 
9.18