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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 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 computations:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Weighted average common shares issued
113,731,354

 
105,563,455

 
109,669,968

 
105,563,455

Average treasury stock shares
(16,435,520
)
 
(16,620,341
)
 
(16,481,109
)
 
(16,621,717
)
Average unearned nonvested shares
(112,235
)
 
(111,356
)
 
(109,313
)
 
(105,815
)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share
97,183,599

 
88,831,758

 
93,079,546

 
88,835,923

Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share
48,689

 
6,856

 
46,393

 
4,760

Weighted average common shares and common stock equivalents used to calculate diluted earnings per share
97,232,288

 
88,838,614

 
93,125,939

 
88,840,683
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.
 
2017
 
2016
 
 
 
Price Range
 
 
 
Price Range
 
Shares
 
From
 
To
 
Shares
 
From
 
To
Restricted Stock
26,022

 
$
9.26

 
$
13.96

 
81,887

 
$
7.57

 
$
9.84

Restricted Stock Units
24,375

 
$
15.09

 
$
15.09

 
—

 
$
—

 
$
—