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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Summary of Outstanding Shares of Common Stock
The following table summarizes outstanding shares of common stock:
Year ended December 31,
In thousands202120202019
Shares outstanding at beginning of year44,368 44,248 43,959 
Treasury shares issued for:
Restricted stock awards181 110 188 
Employee stock options exercised— 10 101 
Shares outstanding at end of year44,549 44,368 44,248