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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted net income per common share
The following table sets forth the computation of basic and diluted net income per common share for the years indicated (in thousands, except per share data):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Net income
$
166,111

 
$
67,821

 
$
100,656

Dividends and undistributed earnings allocated to unvested shares
(1,184
)
 
(571
)
 
—

Preferred dividends
—

 
—

 
(21
)
Net income available to common stockholders
$
164,927

 
$
67,250

 
$
100,635

Income per common share:
 
 
 
 
 
Basic
$
2.07

 
$
0.92

 
$
1.40

Diluted
2.07

 
0.92

 
1.40

Weighted average common shares:
 
 
 
 
 
Basic
79,662

 
73,247

 
71,910

Effect of dilutive securities:
 
 
 
 
 
Stock options
7

 
12

 
5

Restricted stock units
2

 
—

 
—

Diluted
79,671

 
73,259

 
71,915