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Earnings Per Common Share
3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Common Share
Earnings Per Common Share  
 
Nonvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents are participating securities and are included in the computation of earnings per share pursuant to the two-class method.  The two-class method is an earnings allocation formula that determines earnings per share for each class of common stock and participating security according to dividends declared (or accumulated) and participation rights in undistributed earnings. Certain of the Company's nonvested restricted stock awards qualify as participating securities. 
 
Net earnings is allocated between the common stock and participating securities pursuant to the two-class method.  Basic earnings per common share is computed by dividing net earnings available to common shareholders by the weighted average number of common shares outstanding during the period, excluding participating nonvested restricted shares. 
 
Diluted earnings per common share is computed in a similar manner, except that first the denominator is increased to include the number of additional common shares that would have been outstanding if potentially dilutive common shares, excluding the participating securities, were issued using the treasury stock method. For all periods presented, stock options, restricted stock awards and restricted stock units are the only potentially dilutive non-participating instruments issued by the Company.  Next, we determine and include in diluted earnings per common share calculation the more dilutive effect of the participating securities using the treasury stock method or the two-class method. Undistributed losses are not allocated to the nonvested share-based payment awards (the participating securities) under the two-class method as the holders are not contractually obligated to share in the losses of the Company. 
 
The following is a computation of basic and diluted earnings per common share for the three months ended March 31, 2017 and 2016
(in thousands, except per share data)
Three Months Ended
 
March 31,
 
2017
 
2016
NUMERATORS:
 
 
 
Net income
$
46,003

 
$
47,569

Less:
 
 
 
Dividends and undistributed earnings allocated to participating securities (1)
12

 
29

Net earnings available to common shareholders
$
45,991

 
$
47,540

DENOMINATORS:
 
 
 
Weighted average number of common shares outstanding - basic
220,287

 
220,227

Effect of potentially dilutive common shares (2)
492

 
825

Weighted average number of common shares outstanding - diluted
220,779

 
221,052

EARNINGS PER COMMON SHARE:
 
 
 
Basic
$
0.21

 
$
0.22

Diluted
$
0.21

 
$
0.22

 
(1)
Represents dividends paid and undistributed earnings allocated to certain nonvested restricted stock awards. 
(2)
Represents the effect of the assumed exercise of stock options, vesting of non-participating restricted shares, and vesting of restricted stock units, based on the treasury stock method. 

The following table presents the weighted average outstanding securities that were not included in the computation of diluted earnings per common share because their effect would be anti-dilutive for the three months ended March 31, 2017 and 2016
(in thousands)
Three Months Ended
 
March 31,
 
2017
 
2016
Stock options
36

 
119

Restricted Stock

 
25