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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2016
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 September 30,
 
For the Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Weighted average common shares issued
105,563,455

 
105,563,455

 
105,563,455

 
105,563,455

Average treasury stock shares
(16,609,505
)
 
(16,602,502
)
 
(16,617,616
)
 
(15,858,433
)
Average unearned nonvested shares
(99,502
)
 
(153,659
)
 
(103,696
)
 
(177,462
)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share
88,854,448

 
88,807,294

 
88,842,143

 
89,527,560

Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share
3,756

 
6,452

 
1,796

 
3,938

Weighted average common shares and common stock equivalents used to calculate diluted earnings per share
88,858,204

 
88,813,746

 
88,843,939

 
89,531,498
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 nine months ended September 30 because to do so would have been antidilutive.
 
2016
 
2015
 
 
 
Price Range
 
 
 
Price Range
 
Shares
 
From
 
To
 
Shares
 
From
 
To
Restricted Stock
72,432

 
$
8.38

 
$
10.09

 
121,091

 
$
5.26

 
$
9.84