Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

EPS Calculation [Table Text Block]

In thousands, except per share data	2016		2015		2014
Net income	$	58,895	$	53,703	$	58,692
Average common shares outstanding - basic	27,647		27,347		27,164
Additional shares for stock-based compensation plans (See Note 6)	132		70		59
Average common shares outstanding - diluted	27,779		27,417		27,223
Earnings per share of common stock - basic	$	2.13	$	1.96	$	2.16
Earnings per share of common stock - diluted	$	2.12	$	1.96	$	2.16
Additional information:
Antidilutive shares	5		12		18