Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

Diluted earnings per share are calculated as follows:

	Three Months Ended March 31,
In thousands, except per share data	2018		2017
Net income	$	41,537	$	40,310
Average common shares outstanding - basic	28,753		28,633
Additional shares for stock-based compensation plans (See Note 6)	50		90
Average common shares outstanding - diluted	28,803		28,723
Earnings per share of common stock - basic	$	1.44	$	1.41
Earnings per share of common stock - diluted	$	1.44	$	1.40
Additional information:
Antidilutive shares	16		22