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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 358,269 499,419
Options vested and exercisable weighted average remaining contractual life 5 years 3 months 21 days 5 years
Options vested and exercisable weighted average exercise price $ 8.48 $ 6.73
Options vested and exercisable intrinsic value $ 6,995 $ 8,892
$4.31-$8.65    
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 $ 8.65  
Number of shares vested and exercisable 317,618  
Options vested and exercisable weighted average remaining contractual life 4 years 11 months 25 days  
Options vested and exercisable weighted average exercise price $ 7.34  
Options vested and exercisable intrinsic value $ 6,563  
$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 32,987  
Options vested and exercisable weighted average remaining contractual life 7 years 7 months 3 days  
Options vested and exercisable weighted average exercise price $ 15.95  
Options vested and exercisable intrinsic value $ 398  
$23.57-$25.84    
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 $ 25.84  
Number of shares vested and exercisable 7,664  
Options vested and exercisable weighted average remaining contractual life 8 years 10 months 28 days  
Options vested and exercisable weighted average exercise price $ 23.57  
Options vested and exercisable intrinsic value $ 34  
$4.31-$8.65    
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   331,944
Options vested and exercisable weighted average remaining contractual life   4 years 14 days
Options vested and exercisable weighted average exercise price   $ 5.71
Options vested and exercisable intrinsic value   $ 6,246
$8.70-$22.76    
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   6 years 2 months 10 days
Options vested and exercisable weighted average exercise price   $ 7.65
Options vested and exercisable intrinsic value   $ 258
$23.57-$25.84    
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   152,175
Options vested and exercisable weighted average remaining contractual life   6 years 11 months 22 days
Options vested and exercisable weighted average exercise price   $ 8.84
Options vested and exercisable intrinsic value   $ 2,388