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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 412,489 390,127
Options vested and exercisable weighted average remaining contractual life 5 years 1 month 7 days 5 years 4 months 5 days
Options vested and exercisable weighted average exercise price $ 12.16 $ 8.76
Options vested and exercisable intrinsic value $ 10,183 $ 7,313
$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-$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  
$4.54-$8.65    
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   $ 8.65
Number of shares vested and exercisable   344,958
Options vested and exercisable weighted average remaining contractual life   5 years 22 days
Options vested and exercisable weighted average exercise price   $ 7.67
Options vested and exercisable intrinsic value   $ 6,843
$8.70-$22.76    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 8.70
Range of exercise prices, upper range   $ 22.76
Number of shares vested and exercisable   37,505
Options vested and exercisable weighted average remaining contractual life   7 years 4 months 21 days
Options vested and exercisable weighted average exercise price   $ 15.77
Options vested and exercisable intrinsic value   $ 440
$23.57-$28.27    
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   $ 28.27
Number of shares vested and exercisable   7,664
Options vested and exercisable weighted average remaining contractual life   8 years 7 months 27 days
Options vested and exercisable weighted average exercise price   $ 23.57
Options vested and exercisable intrinsic value   $ 30