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Stock-Based Compensation (Details 3) - Stock Options
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Stock-based compensation  
Number outstanding (in shares) | shares 171,369
Weighted-average exercise price (in dollars per share) $ 60.66
Weighted-average remaining life 4 years 6 months 22 days
Number exercisable (in shares) | shares 128,105
Weighted-average exercise price (in dollars per share) $ 76.48
Range $7.40 to $60.40  
Stock-based compensation  
Range of exercise prices, lower range limit (in dollars per share) 7.40
Range of exercise prices, upper range limit (in dollars per share) $ 60.40
Number outstanding (in shares) | shares 84,502
Weighted-average exercise price (in dollars per share) $ 30.91
Weighted-average remaining life 5 years 3 months 22 days
Number exercisable (in shares) | shares 44,289
Weighted-average exercise price (in dollars per share) $ 50.77
Range $72.50 to $119.00  
Stock-based compensation  
Range of exercise prices, lower range limit (in dollars per share) 72.50
Range of exercise prices, upper range limit (in dollars per share) $ 119.00
Number outstanding (in shares) | shares 84,467
Weighted-average exercise price (in dollars per share) $ 88.65
Weighted-average remaining life 3 years 10 months 17 days
Number exercisable (in shares) | shares 81,416
Weighted-average exercise price (in dollars per share) $ 89.10
Range $123.10 to $123.10  
Stock-based compensation  
Range of exercise prices, lower range limit (in dollars per share) 123.10
Range of exercise prices, upper range limit (in dollars per share) $ 123.10
Number outstanding (in shares) | shares 2,400
Weighted-average exercise price (in dollars per share) $ 123.10
Weighted-average remaining life 2 years 1 month 6 days
Number exercisable (in shares) | shares 2,400
Weighted-average exercise price (in dollars per share) $ 123.10