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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 375,795 455,887
Options vested and exercisable weighted average remaining contractual life 5 years 1 month 1 day 5 years 2 months 5 days
Options vested and exercisable weighted average exercise price $ 8.72 $ 7.20
Options vested and exercisable intrinsic value $ 7,554 $ 5,551
$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 329,433  
Options vested and exercisable weighted average remaining contractual life 4 years 9 months 15 days  
Options vested and exercisable weighted average exercise price $ 7.62  
Options vested and exercisable intrinsic value $ 6,984  
$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 38,598  
Options vested and exercisable weighted average remaining contractual life 7 years 5 days  
Options vested and exercisable weighted average exercise price $ 15.09  
Options vested and exercisable intrinsic value $ 530  
$23.57-$28.20    
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 $ 28.20  
Number of shares vested and exercisable 7,764  
Options vested and exercisable weighted average remaining contractual life 8 years 3 months 21 days  
Options vested and exercisable weighted average exercise price $ 23.61  
Options vested and exercisable intrinsic value $ 40  
$4.31-$7.18    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 4.31
Range of exercise prices, upper range   $ 7.18
Number of shares vested and exercisable   261,442
Options vested and exercisable weighted average remaining contractual life   4 years 1 month 9 days
Options vested and exercisable weighted average exercise price   $ 5.93
Options vested and exercisable intrinsic value   $ 3,516
$7.44-$8.17    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 7.44
Range of exercise prices, upper range   $ 8.17
Number of shares vested and exercisable   17,550
Options vested and exercisable weighted average remaining contractual life   5 years 10 months 2 days
Options vested and exercisable weighted average exercise price   $ 7.72
Options vested and exercisable intrinsic value   $ 205
$8.65-$23.57    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 8.65
Range of exercise prices, upper range   $ 23.57
Number of shares vested and exercisable   176,895
Options vested and exercisable weighted average remaining contractual life   6 years 8 months 15 days
Options vested and exercisable weighted average exercise price   $ 9.04
Options vested and exercisable intrinsic value   $ 1,830