Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

EPS Calculation [Table Text Block]

	Three Months Ended March 31,
In thousands, except per share data	2016		2015
Net income	$	36,641	$	28,486
Average common shares outstanding - basic	27,448		27,301
Additional shares for stock-based compensation plans (See Note 5)	112		68
Average common shares outstanding - diluted	27,560		27,369
Earnings per share of common stock - basic	$	1.33	$	1.04
Earnings per share of common stock - diluted	$	1.33	$	1.04
Additional information:
Antidilutive shares	22		28