Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

EPS Calculation [Table Text Block]

	Three Months Ended March 31,
In thousands, except per share data	2017		2016
Net income	$	40,310	$	36,641
Average common shares outstanding - basic	28,633		27,448
Additional shares for stock-based compensation plans (See Note 5)	90		112
Average common shares outstanding - diluted	28,723		27,560
Earnings per share of common stock - basic	$	1.41	$	1.33
Earnings per share of common stock - diluted	$	1.40	$	1.33
Additional information:
Antidilutive shares	22		22