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Stock Plans - Option Exercise Ranges (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Options Outstanding  
Options Outstanding, Shares | shares 1,119
Weighted Average Remaining Contractual Life 2 years
Options Outstanding and Exercisable  
Weighted Average Exercise Price (in dollars per share) $ 34.88
$20.00 - $30.00  
Stock plans  
Exercise price, low end of range (in dollars per share) 20.00
Exercise price, high end of range (in dollars per share) $ 30.00
Options Outstanding  
Weighted Average Remaining Contractual Life 2 years 7 months 6 days
Options Outstanding and Exercisable  
Outstanding and Exercisable (in shares) | shares 20
Weighted Average Exercise Price (in dollars per share) $ 27.83
$30.01 - $40.00  
Stock plans  
Exercise price, low end of range (in dollars per share) 30.01
Exercise price, high end of range (in dollars per share) $ 40.00
Options Outstanding and Exercisable  
Outstanding and Exercisable (in shares) | shares 969
Weighted Average Remaining Contractual life 2 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share) $ 32.81
$40.01 - $50.00  
Stock plans  
Exercise price, low end of range (in dollars per share) 40.01
Exercise price, high end of range (in dollars per share) $ 50.00
Options Outstanding  
Weighted Average Remaining Contractual Life 9 months 18 days
Options Outstanding and Exercisable  
Outstanding and Exercisable (in shares) | shares 10
Weighted Average Exercise Price (in dollars per share) $ 46.14
$50.01 - $60.00  
Stock plans  
Exercise price, low end of range (in dollars per share) 50.01
Exercise price, high end of range (in dollars per share) $ 60.00
Options Outstanding  
Weighted Average Remaining Contractual Life 1 year 4 months 24 days
Options Outstanding and Exercisable  
Outstanding and Exercisable (in shares) | shares 120
Weighted Average Exercise Price (in dollars per share) $ 51.70