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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 449,616 416,282
Options vested and exercisable weighted average remaining contractual life 5 years 6 months 29 days 4 years 11 months 5 days
Options vested and exercisable weighted average exercise price $ 21.25 $ 12.42
Options vested and exercisable intrinsic value $ 7,440 $ 4,227
$5.67 - $32.80    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range $ 5.67  
Range of exercise prices, upper range $ 32.8  
Number of shares vested and exercisable 362,715  
Options vested and exercisable weighted average remaining contractual life 5 years 6 months 15 days  
Options vested and exercisable weighted average exercise price $ 18.14  
Options vested and exercisable intrinsic value $ 7,132  
$32.85 - $33.80    
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 $ 33.8  
Number of shares vested and exercisable 5,484  
Options vested and exercisable weighted average remaining contractual life 4 years 29 days  
Options vested and exercisable weighted average exercise price $ 33.18  
Options vested and exercisable intrinsic value $ 25  
$34.00 - $40.60    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range $ 34.00  
Range of exercise prices, upper range $ 40.60  
Number of shares vested and exercisable 81,417  
Options vested and exercisable weighted average remaining contractual life 5 years 10 months 13 days  
Options vested and exercisable weighted average exercise price $ 34.32  
Options vested and exercisable intrinsic value $ 283  
$4.54 - $22.76    
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   $ 22.76
Number of shares vested and exercisable   374,792
Options vested and exercisable weighted average remaining contractual life   4 years 7 months 10 days
Options vested and exercisable weighted average exercise price   $ 10.96
Options vested and exercisable intrinsic value   $ 4,209
$23.57 - $32.80    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 23.57
Range of exercise prices, upper range   $ 32.80
Number of shares vested and exercisable   41,490
Options vested and exercisable weighted average remaining contractual life   7 years 10 months 10 days
Options vested and exercisable weighted average exercise price   $ 25.61
Options vested and exercisable intrinsic value   $ 18
$32.85 - $37.30    
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   $ 37.30
Number of shares vested and exercisable   0
Options vested and exercisable weighted average exercise price   $ 0.00
Options vested and exercisable intrinsic value   $ 0