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Earnings and Dividends Per Share
6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Share EARNINGS AND DIVIDENDS PER COMMON SHARE

The weighted average number of common shares outstanding during the reporting period is used to calculate basic earnings per common share. Diluted earnings per common share assume the exercise of stock options and the conversion of our convertible debt using the treasury stock method, to the extent dilutive. If our average stock price for the period increases over the conversion price of our convertible debt, the conversion feature will be considered dilutive.

The following table summarizes the average number of common shares and the net income used in the calculation of basic and diluted earnings per common share (in thousands, except share and per share amounts):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
Net income attributable to common stockholders
$
39,979

 
$
37,839

 
$
75,658

 
$
76,271

 
 
 
 
 
 
 
 
BASIC:
 
 
 
 
 
 
 
Weighted average common shares outstanding
43,232,384

 
41,704,819

 
43,029,104

 
41,618,487

 
 
 
 
 
 
 
 
DILUTED:
 
 
 
 
 
 
 
Weighted average common shares outstanding
43,232,384

 
41,704,819

 
43,029,104

 
41,618,487

Stock options
66,145

 
57,759

 
70,920

 
51,241

Convertible subordinated debentures
199,492

 
24,251

 
211,503

 
12,126

Weighted average dilutive common shares outstanding
43,498,021

 
41,786,829

 
43,311,527

 
41,681,854

 
 
 
 
 
 
 
 
Net income attributable to common stockholders - basic
$
.92

 
$
.91

 
$
1.76

 
$
1.83

Net income attributable to common stockholders - diluted
$
.92

 
$
.91

 
$
1.75

 
$
1.83

 
 
 
 
 
 
 
 
Incremental anti-dilutive shares excluded:
 
 
 
 
 
 
 
Net share effect of stock options with an exercise price in excess of the average market price for our common shares
40,173

 
33,554

 
21,227

 
50,952

 
 
 
 
 
 
 
 
Regular dividends declared per common share
$
1.05

 
$
1.00

 
$
2.10

 
$
2.00