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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share, Basic
The following table sets forth the computation of earnings per share using the two-class method (in thousands, except share and per share amounts):
 
Years ended December 31,
 
2018
 
2017
 
2016
Basic earnings per share:
 
 
 
 
 
Net income
$
157,981

 
$
156,963

 
$
94,760

Allocation of net income to common stockholders:
 
 
 
 
 
Common stock
$
157,096

 
$
155,995

 
$
93,919

Unvested participating shares
885

 
968

 
841

 
$
157,981

 
$
156,963

 
$
94,760

 
 
 
 
 
 
Weighted average number of common shares:
 
 
 
 
 
Common stock
57,812,602

 
58,873,196

 
59,229,069

Unvested participating shares
325,289

 
366,029

 
531,364

Earnings per common share:
 
 
 
 
 
Common stock
$
2.72

 
$
2.65


$
1.59

Earnings Per Share, Diluted
The Company calculates diluted earnings per share for common stock using the more dilutive of the treasury stock method, or the two-class method. The following table sets forth the computation of diluted earnings per share using the two-class method (in thousands, except share and per share amounts):
 
Years ended December 31,
 
2018
 
2017
 
2016
Diluted earnings per share:
 
 
 
 
 
Earnings allocated to common stock
$
157,096

 
$
155,995

 
$
93,919

Plus earnings allocated to unvested participating shares
885

 
968

 
841

Less adjusted earnings allocated to unvested participating shares
(867
)
 
(947
)
 
(822
)
Earnings allocated to common stock
$
157,114

 
$
156,016

 
$
93,938

 
 
 
 
 
 
Weighted average number of common shares:
 
 
 
 
 
Common stock
57,812,602

 
58,873,196

 
59,229,069

Effect of dilutive securities
1,188,067

 
1,380,495

 
1,365,826

 
59,000,669

 
60,253,691

 
60,594,895

Earnings per common share:
 
 
 
 
 
Common stock
$
2.66

 
$
2.59

 
$
1.55