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Stock-Based Compensation (Details 4) - Stock Options
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Stock-based compensation  
Number of outstanding options | shares 308,967
Weighted average exercise price, outstanding options $ 60.80
Weighted average contractual term 5 years 10 months 10 days
Number of exercisable options | shares 201,595
Weighted average exercise price, exercisable options $ 75.42
Exercise Price From 0-29.99 Dollars  
Stock-based compensation  
Weighted average exercise price, lower range limit 0.00
Weighted average exercise price, upper range limit $ 29.99
Number of outstanding options | shares 48,892
Weighted average exercise price, outstanding options $ 14.97
Weighted average contractual term 9 years 4 months 21 days
Number of exercisable options | shares 3,759
Weighted average exercise price, exercisable options $ 26.15
Exercise Price From 30.00-54.99 Dollars  
Stock-based compensation  
Weighted average exercise price, lower range limit 30.00
Weighted average exercise price, upper range limit $ 54.99
Number of outstanding options | shares 96,866
Weighted average exercise price, outstanding options $ 38.39
Weighted average contractual term 7 years 8 months 23 days
Number of exercisable options | shares 48,433
Weighted average exercise price, exercisable options $ 38.39
Exercise Price From 55.00-79.99 Dollars  
Stock-based compensation  
Weighted average exercise price, lower range limit 55.00
Weighted average exercise price, upper range limit $ 79.99
Number of outstanding options | shares 94,903
Weighted average exercise price, outstanding options $ 70.27
Weighted average contractual term 3 years 11 months 16 days
Number of exercisable options | shares 85,785
Weighted average exercise price, exercisable options $ 69.57
Exercise Price From 80.00-104.99 Dollars  
Stock-based compensation  
Weighted average exercise price, lower range limit 80.00
Weighted average exercise price, upper range limit $ 104.99
Number of outstanding options | shares 30,941
Weighted average exercise price, outstanding options $ 88.28
Weighted average contractual term 5 years 4 months 2 days
Number of exercisable options | shares 26,253
Weighted average exercise price, exercisable options $ 89.35
Exercise Price From 105.00-129.99 Dollars  
Stock-based compensation  
Weighted average exercise price, lower range limit 105.00
Weighted average exercise price, upper range limit $ 129.99
Number of outstanding options | shares 22,900
Weighted average exercise price, outstanding options $ 119.73
Weighted average contractual term 2 years 2 months 23 days
Number of exercisable options | shares 22,900
Weighted average exercise price, exercisable options $ 119.73
Exercise Price From 130.50-159.99 Dollars  
Stock-based compensation  
Weighted average exercise price, lower range limit 130.00
Weighted average exercise price, upper range limit $ 159.99
Number of outstanding options | shares 14,465
Weighted average exercise price, outstanding options $ 151.51
Weighted average contractual term 8 months 12 days
Number of exercisable options | shares 14,465
Weighted average exercise price, exercisable options $ 151.51