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Stock Repurchase Program
 12 Months Ended
Dec. 31, 2021
Class of Stock Disclosures [Abstract]  
Stock Repurchase Program Stock Repurchase Program
Under our stock repurchase program, we repurchased shares as follows:
Year Ended December 31,
(in thousands, except per share data)202120202019
Number of shares repurchased347 690 330 
Average price paid per share$388.35 $233.48 $179.41 
Total cost$134,679 $161,029 $59,116 
As of December 31, 2021, 2.5 million shares remained available for repurchase under the program.