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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Common Share
The computation of basic and diluted earnings per common share is presented below for the periods indicated (in thousands, except share and per share data):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
c
2020
 
2019
 
2020

2019
Basic earnings per common share:
 
 
 
 
 

 
 
Numerator:
 
 
 
 
 

 
 
Net income
$
76,508

 
$
81,451

 
$
45,557

 
$
147,423

Distributed and undistributed earnings allocated to participating securities
(3,353
)
 
(3,382
)
 
(1,939
)
 
(6,074
)
Income allocated to common stockholders for basic earnings per common share
$
73,155

 
$
78,069

 
$
43,618

 
$
141,349

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding
92,409,949

 
97,451,019

 
93,177,243

 
98,150,014

Less average unvested stock awards
(1,207,798
)
 
(1,174,339
)
 
(1,154,589
)
 
(1,173,137
)
Weighted average shares for basic earnings per common share
91,202,151

 
96,276,680

 
92,022,654

 
96,976,877

Basic earnings per common share
$
0.80

 
$
0.81

 
$
0.47

 
$
1.46

Diluted earnings per common share:
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Income allocated to common stockholders for basic earnings per common share
$
73,155

 
$
78,069

 
$
43,618

 
$
141,349

Adjustment for earnings reallocated from participating securities
—

 
9

 
—

 
13

Income used in calculating diluted earnings per common share
$
73,155

 
$
78,078

 
$
43,618

 
$
141,362

Denominator:
 
 


 
 
 
 
Weighted average shares for basic earnings per common share
91,202,151

 
96,276,680

 
92,022,654

 
96,976,877

Dilutive effect of stock options and certain shared-based awards
705

 
345,899

 
126,858

 
312,821

Weighted average shares for diluted earnings per common share
91,202,856

 
96,622,579

 
92,149,512

 
97,289,698

Diluted earnings per common share
$
0.80

 
$
0.81

 
$
0.47

 
$
1.45