Earnings Per Share (tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

EPS Calculation [Table Text Block]

In thousands, except per share data	2014		2013		2012
Net income	$	58,692	$	60,538	$	58,779
Average common shares outstanding - basic	27,164		26,974		26,831
Additional shares for stock-based compensation plans (See Note 6)	59		53		76
Average common shares outstanding - diluted	27,223		27,027		26,907
Earnings per share of common stock - basic	$	2.16	$	2.24	$	2.19
Earnings per share of common stock - diluted	$	2.16	$	2.24	$	2.18
Additional information:
Antidilutive shares not included in net income per diluted common share calculation	18		26		1