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Stock Repurchase Program (Tables)
 12 Months Ended
Dec. 31, 2019
Class of Stock Disclosures [Abstract]  
Stock Repurchase Program
Under our stock repurchase program, we repurchased shares as follows:
 
Year Ended December 31,
(in thousands, except per share data)
2019
 
2018
 
2017
Number of shares repurchased
330

 
1,674

 
2,750

Average price paid per share
$
179.41

 
$
161.12

 
$
122.20

Total cost
$
59,116

 
$
269,801

 
$
336,042