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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Weighted average common shares issued
113,914,902

 
113,731,354

 
113,914,902

 
109,669,968

Average treasury stock shares
(14,460,352
)
 
(16,435,520
)
 
(15,409,475
)
 
(16,481,109
)
Average deferred compensation shares
(37,411
)
 
—

 
(37,411
)
 
—

Average unearned nonvested shares
(112,130
)
 
(112,235
)
 
(93,772
)
 
(109,313
)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share
99,305,009

 
97,183,599

 
98,374,244

 
93,079,546

Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share
161,989

 
48,689

 
117,505

 
46,393

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

 
—

 
37,411

 
—

Weighted average common shares and common stock equivalents used to calculate diluted earnings per share
99,504,409

 
97,232,288

 
98,529,160

 
93,125,939
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.
 
2018
 
2017
 
 
 
Price Range
 
 
 
Price Range
 
Shares
 
From
 
To
 
Shares
 
From
 
To
Restricted Stock
55,607

 
$
13.96

 
$
14.49

 
26,022

 
$
9.26

 
$
13.96

Restricted Stock Units
61,065

 
$
14.17

 
$
15.83

 
24,375

 
$
15.09

 
$
15.09