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Stock Repurchase Program (Tables)
 6 Months Ended
Jun. 30, 2018
Class of Stock Disclosures [Abstract]  
Stock Repurchase Program
Under the Company's stock repurchase program, the Company repurchased shares as follows:
 
Six Months Ended
(in thousands, except per share data)
June 30,
2018
 
June 30,
2017
Number of shares repurchased
750

 
2,000

Average price paid per share
$
157.11

 
$
111.65

Total cost
$
117,831

 
$
223,291