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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2017
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 computation for the years ending December 31:
 
 
2017
 
2016
 
2015
Weighted average common shares issued
111,809,880

 
105,563,455

 
105,563,455

Average treasury shares
(16,463,079
)
 
(16,605,461
)
 
(16,045,900
)
Average deferred compensation shares
(37,411
)
 
—

 
—

Average unearned nonvested shares
(89,334
)
 
(106,421
)
 
(160,788
)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share
95,220,056

 
88,851,573

 
89,356,767

Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share
73,570

 
—

 
—

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

 
—

 
—

Weighted average common shares and common stock equivalents used to calculate diluted earnings per share
95,331,037

 
88,851,573

 
89,356,767
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 years ended December 31, because to do so would have been anti-dilutive.
 
12/31/2017
 
12/31/2016
 
12/31/2015
 
 
 
Price Range
 
 
 
Price Range
 
 
 
Price Range
 
Shares
 
From
 
To
 
Shares
 
From
 
To
 
Shares
 
From
 
To
Restricted Stock
18,173

 
$
8.55

 
$
13.96

 
67,920

 
$
8.38

 
$
13.96

 
92,002

 
$
6.82

 
$
9.84