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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 390,127 419,112
Options vested and exercisable weighted average remaining contractual life 5 years 4 months 5 days 5 years 4 months 6 days
Options vested and exercisable weighted average exercise price $ 8.76 $ 7.20
Options vested and exercisable intrinsic value $ 7,313 $ 6,421
$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 23 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 20 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 28 days  
Options vested and exercisable weighted average exercise price $ 23.57  
Options vested and exercisable intrinsic value $ 30  
$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   221,842
Options vested and exercisable weighted average remaining contractual life   4 years 30 days
Options vested and exercisable weighted average exercise price   $ 5.74
Options vested and exercisable intrinsic value   $ 3,722
$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   15,300
Options vested and exercisable weighted average remaining contractual life   5 years 11 months 8 days
Options vested and exercisable weighted average exercise price   $ 7.65
Options vested and exercisable intrinsic value   $ 227
$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   181,970
Options vested and exercisable weighted average remaining contractual life   6 years 10 months 7 days
Options vested and exercisable weighted average exercise price   $ 8.94
Options vested and exercisable intrinsic value   $ 2,472