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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted earnings per common share
The following table sets forth the computation of basic and diluted earnings per common share:
 
Year ended December 31
(In thousands, except share data)
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
 
Net income
 
$
84,242

 
$
86,135

 
$
81,012

Denominator:
 
 
 
 
 
 
Weighted-average common shares outstanding
 
15,295,573

 
15,332,553

 
15,364,281

Effect of dilutive PBRSUs
 
94,779

 
72,607

 
40,459

Weighted-average common shares outstanding adjusted for the effect of dilutive PBRSUs
 
15,390,352

 
15,405,160

 
15,404,740

Earnings per common share:
 
 
 
 
 
 
Basic earnings per common share
 
$
5.51

 
$
5.62

 
$
5.27

Diluted earnings per common share
 
$
5.47

 
$
5.59

 
$
5.26