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Basis of presentation (Tables)
 3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Summary of Basic and Diluted Earnings Per Common Share
The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented:
 
 
Three Months Ended March 31,
 
 
 
2019

 
2018

Basic earnings per common share calculation:
 
 
 
 
Net income
 
$
19,588

 
$
19,754

Dividends paid on and undistributed earnings allocated to
participating securities
 
(105
)
 
—

Earnings attributable to common shareholders
 
$
19,483

 
$
19,754

Weighted-average basic shares outstanding
 
30,786,684

 
30,613,284

Basic earnings per common share
 
$
0.63

 
$
0.65

Diluted earnings per common share:
 
 
 
 
Earnings attributable to common shareholders
 
19,483

 
19,754

Weighted-average basic shares outstanding
 
30,786,684

 
30,613,284

Weighted-average diluted shares contingently issuable
 
562,514

 
808,546

Weighted-average diluted shares outstanding
 
31,349,198

 
31,421,830

Diluted earnings per common share
 
$
0.62

 
$
0.63