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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 683,489 560,848
Options vested and exercisable weighted average remaining contractual life 6 years 8 months 12 days 5 years 3 months 18 days
Options vested and exercisable weighted average exercise price $ 26.11 $ 18.67
Options vested and exercisable intrinsic value $ 13,718 $ 11,400
$6.13 - $33.20    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range $ 6.13  
Range of exercise prices, upper range $ 33.20  
Number of shares vested and exercisable 496,465  
Options vested and exercisable weighted average remaining contractual life 6 years 1 month 10 days  
Options vested and exercisable weighted average exercise price $ 22.56  
Options vested and exercisable intrinsic value $ 11,727  
$33.40 - $40.87    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range $ 33.40  
Range of exercise prices, upper range $ 40.87  
Number of shares vested and exercisable 187,024  
Options vested and exercisable weighted average remaining contractual life 8 years 3 months 11 days  
Options vested and exercisable weighted average exercise price $ 35.53  
Options vested and exercisable intrinsic value $ 1,991  
$41.37 - $46.18    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range $ 41.37  
Range of exercise prices, upper range $ 46.18  
Number of shares vested and exercisable 0  
Options vested and exercisable weighted average exercise price $ 0.00  
Options vested and exercisable intrinsic value $ 0  
$4.54 - $32.80    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 4.54
Range of exercise prices, upper range   $ 32.80
Number of shares vested and exercisable   486,601
Options vested and exercisable weighted average remaining contractual life   5 years 2 months 9 days
Options vested and exercisable weighted average exercise price   $ 16.32
Options vested and exercisable intrinsic value   $ 11,036
$32.85 - $34.10    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 32.85
Range of exercise prices, upper range   $ 34.10
Number of shares vested and exercisable   65,054
Options vested and exercisable weighted average remaining contractual life   5 years 7 months 21 days
Options vested and exercisable weighted average exercise price   $ 34.06
Options vested and exercisable intrinsic value   $ 322
$34.15 - $39.00    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 34.15
Range of exercise prices, upper range   $ 39.00
Number of shares vested and exercisable   9,193
Options vested and exercisable weighted average remaining contractual life   8 years 10 months 24 days
Options vested and exercisable weighted average exercise price   $ 34.45
Options vested and exercisable intrinsic value   $ 42