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Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Activity
RSU activity was as follows for the year ended December 31, 2018:
 
Number of
Shares

 
Weighted-Average
Grant Date Fair 
Value Per Share

Balance at December 31, 2017
2,384,501

 
$
60.40

Granted
896,962

 
$
67.17

Vested
(998,145
)
 
$
56.44

Forfeited
(153,692
)
 
$
62.56

Balance at December 31, 2018
2,129,626

 
$
64.94