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Stock Repurchase Program (Tables)
12 Months Ended
Dec. 31, 2016
Class of Stock Disclosures [Abstract]  
Stock Repurchase Program
Under the Company's stock repurchase program, the Company repurchased shares as follows:
 
Year Ended December 31,
(in thousands, except per share data)
2016
 
2015
 
2014
Number of shares repurchased
3,700

 
3,833

 
2,977

Average price paid per share
$
90.90

 
$
88.16

 
$
78.54

Total cost
$
336,335

 
$
337,910

 
$
233,793