Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

EPS Calculation [Table Text Block]

In thousands, except per share data	2015		2014		2013
Net income	$	53,703	$	58,692	$	60,538
Average common shares outstanding - basic	27,347		27,164		26,974
Additional shares for stock-based compensation plans (See Note 6)	70		59		53
Average common shares outstanding - diluted	27,417		27,223		27,027
Earnings per share of common stock - basic	$	1.96	$	2.16	$	2.24
Earnings per share of common stock - diluted	$	1.96	$	2.16	$	2.24
Additional information:
Antidilutive shares	12		18		26