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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 514,612 412,489
Options vested and exercisable weighted average remaining contractual life 5 years 8 months 1 day 5 years 1 month 6 days
Options vested and exercisable weighted average exercise price $ 20.39 $ 12.16
Options vested and exercisable intrinsic value $ 6,712 $ 10,183
$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 $ 32.8  
Number of shares vested and exercisable 425,351  
Options vested and exercisable weighted average remaining contractual life 5 years 7 months 2 days  
Options vested and exercisable weighted average exercise price $ 17.47  
Options vested and exercisable intrinsic value $ 6,711  
$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 67,654  
Options vested and exercisable weighted average remaining contractual life 5 years 2 months 5 days  
Options vested and exercisable weighted average exercise price $ 34.02  
Options vested and exercisable intrinsic value $ 1  
$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  
Number of shares vested and exercisable 21,607  
Options vested and exercisable weighted average remaining contractual life 8 years 8 months 23 days  
Options vested and exercisable weighted average exercise price $ 35.10  
Options vested and exercisable intrinsic value $ 0  
$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   378,504
Options vested and exercisable weighted average remaining contractual life   4 years 10 months 6 days
Options vested and exercisable weighted average exercise price   $ 10.98
Options vested and exercisable intrinsic value   $ 9,792
$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   33,985
Options vested and exercisable weighted average remaining contractual life   7 years 11 months 12 days
Options vested and exercisable weighted average exercise price   $ 25.34
Options vested and exercisable intrinsic value   $ 391
$32.85 - $36.30    
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   $ 36.3
Number of shares vested and exercisable   0
Options vested and exercisable weighted average exercise price   $ 0.00
Options vested and exercisable intrinsic value   $ 0