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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of shares vested and exercisable 359,656 358,269
Options vested and exercisable weighted average remaining contractual life 5 years 6 months 6 days 5 years 3 months 22 days
Options vested and exercisable weighted average exercise price $ 11.96 $ 8.48
Options vested and exercisable intrinsic value $ 8,414 $ 6,995
$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 341,654  
Options vested and exercisable weighted average remaining contractual life 5 years 4 months 27 days  
Options vested and exercisable weighted average exercise price $ 11.31  
Options vested and exercisable intrinsic value $ 8,213  
$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 18,002  
Options vested and exercisable weighted average remaining contractual life 7 years 6 months 6 days  
Options vested and exercisable weighted average exercise price $ 24.19  
Options vested and exercisable intrinsic value $ 201  
$32.85-$36.70    
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 $ 36.70  
Number of shares vested and exercisable 0  
Options vested and exercisable weighted average exercise price $ 0.00  
Options vested and exercisable intrinsic value $ 0  
$4.31-$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 1 day
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