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Stock Plans - Option Exercise Ranges (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Options Outstanding  
Options Outstanding, Shares | shares 1,222
Weighted Average Remaining Contractual Life 3 years
Weighted-Average Exercise Price (in dollars per share) $ 34.80
Options Exercisable  
Options Exercisable, Shares | shares 1,222
Weighted Average Remaining Contractual life 3 years
Weighted Average Exercise Price (in dollars per share) $ 34.80
$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  
Options Outstanding, Shares | shares 25
Weighted Average Remaining Contractual Life 3 years 7 months 6 days
Weighted-Average Exercise Price (in dollars per share) $ 28.13
Options Exercisable  
Options Exercisable, Shares | shares 25
Weighted Average Remaining Contractual life 3 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share) $ 28.13
$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  
Options Outstanding, Shares | shares 1,058
Weighted Average Remaining Contractual Life 3 years 1 month 6 days
Weighted-Average Exercise Price (in dollars per share) $ 32.81
Options Exercisable  
Options Exercisable, Shares | shares 1,058
Weighted Average Remaining Contractual life 3 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  
Options Outstanding, Shares | shares 12
Weighted Average Remaining Contractual Life 1 year 8 months 12 days
Weighted-Average Exercise Price (in dollars per share) $ 45.57
Options Exercisable  
Options Exercisable, Shares | shares 12
Weighted Average Remaining Contractual life 1 year 8 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 45.57
$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  
Options Outstanding, Shares | shares 127
Weighted Average Remaining Contractual Life 2 years 4 months 24 days
Weighted-Average Exercise Price (in dollars per share) $ 51.70
Options Exercisable  
Options Exercisable, Shares | shares 127
Weighted Average Remaining Contractual life 2 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 51.70