Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Summary of Outstanding Shares of Common Stock

The following table summarizes outstanding shares of common stock:

	Year ended December 31
In thousands	2020		2019		2018
Shares outstanding at beginning of year		44,248		43,959		43,614
Treasury shares issued for:
Restricted stock awards		110		188		304
Employee stock options exercised		10		101		41
Shares outstanding at end of year		44,368		44,248		43,959