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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2019
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,
 
2019
 
2018
 
2019
 
2018
Weighted average common shares issued
113,914,902

 
113,914,902

 
113,914,902

 
113,914,902

Average treasury stock shares
(15,398,192
)
 
(14,460,352
)
 
(15,345,018
)
 
(15,409,475
)
Average deferred compensation shares
(37,411
)
 
(37,411
)
 
(37,411
)
 
(37,411
)
Average unearned nonvested shares
(132,625
)
 
(112,130
)
 
(119,981
)
 
(93,772
)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share
98,346,674

 
99,305,009

 
98,412,492

 
98,374,244

Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share
216,524

 
161,989

 
201,907

 
117,505

Additional common stock equivalents (deferred compensation) used to calculate diluted earnings per share
37,411

 
37,411

 
37,411

 
37,411

Weighted average common shares and common stock equivalents used to calculate diluted earnings per share
98,600,609

 
99,504,409

 
98,651,810

 
98,529,160

Basic Earnings per Share
$
0.28

 
$
0.32

 
$
0.53

 
$
0.56

Diluted Earnings per Share
$
0.28

 
$
0.32

 
$
0.53

 
$
0.56
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.
 
2019
 
2018
 
 
 
Price Range
 
 
 
Price Range
 
Shares
 
From
 
To
 
Shares
 
From
 
To
Restricted Stock
106,631

 
$
10.02

 
$
14.49

 
55,607

 
$
13.96

 
$
14.49

Restricted Stock Units
21,888

 
$
16.62

 
$
16.62

 
61,065

 
$
14.17

 
$
15.83