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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 419,112 724,501
Options vested and exercisable weighted average remaining contractual life 5 years 4 months 5 days 4 years 8 months 23 days
Options vested and exercisable weighted average exercise price $ 7.20 $ 6.22
Options vested and exercisable intrinsic value $ 6,421 $ 11,687
$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 1 month  
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 10 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 5 days  
Options vested and exercisable weighted average exercise price $ 8.94  
Options vested and exercisable intrinsic value $ 2,472  
$3.21-$6.89    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 3.21
Range of exercise prices, upper range   $ 6.89
Number of shares vested and exercisable   472,028
Options vested and exercisable weighted average remaining contractual life   3 years 7 months 12 days
Options vested and exercisable weighted average exercise price   $ 5.04
Options vested and exercisable intrinsic value   $ 8,171
$7.13-$8.17    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise prices, lower range   $ 7.13
Range of exercise prices, upper range   $ 8.17
Number of shares vested and exercisable   56,175
Options vested and exercisable weighted average remaining contractual life   6 years 11 months 2 days
Options vested and exercisable weighted average exercise price   $ 7.25
Options vested and exercisable intrinsic value   $ 848
$8.65-$19.27    
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   $ 19.27
Number of shares vested and exercisable   196,298
Options vested and exercisable weighted average remaining contractual life   6 years 9 months 14 days
Options vested and exercisable weighted average exercise price   $ 8.76
Options vested and exercisable intrinsic value   $ 2,668