Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

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)	2018		2017		2016
Numerator:
Net income	$	110,387	$	84,242	$	86,135
Denominator:
Weighted-average common shares outstanding	15,488,982		15,295,573		15,332,553
Effect of dilutive PBRSUs and TBRSUs	122,507		94,779		72,607
Weighted-average common shares outstanding adjusted for the effect of dilutive PBRSUs and TBRSUs	15,611,489		15,390,352		15,405,160
Earnings per common share:
Basic earnings per common share	$	7.13	$	5.51	$	5.62
Diluted earnings per common share	$	7.07	$	5.47	$	5.59