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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
employee
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual vesting percentage 25.00%    
Vesting period 3 years    
Expiration period 10 years    
Capitalized Amount $ 600 $ 600 $ 400
Allocated stock-based compensation expense $ 9,255 $ 7,867 $ 7,922
Number of options vested and expected to vest | shares 31,500 31,500 40,000
Termination      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 90 days    
Death, Disability, or Retirement      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 365 days    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Aggregate Intrinsic Value $ 3,164 $ 2,600 [1] $ 11,000 [1]
Allocated stock-based compensation expense 5,300 $ 4,300 $ 3,900
Unrecognized compensation expense related to granted but unvested stock options $ 10,800    
Unrecognized compensation cost, period for recognition 2 years 8 months 12 days    
Number of options vested and expected to vest | shares 5,490,269    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to granted but unvested stock options $ 5,600    
Unrecognized compensation cost, period for recognition 1 year 9 months 25 days    
Shares granted | shares [2] 439,510    
Weighted average grant date fair value of shares granted | $ / shares $ 16.03 $ 13.25 $ 14.60
Fair value of shares vested $ 2,200 $ 7,600 $ 800
Restricted stock expense $ 2,800 $ 2,600 $ 2,500
Shares of unvested restricted stock | shares [2] 885,060 672,307  
Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted | shares [2] 192,624    
2015 Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares authorized (shares) | shares 3,986,760    
Shares available for grant under the plan | shares 2,400,000    
2015 Stock Incentive Plan | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Estimated forfeiture rate 14.00% 14.00% 15.00%
2015 Stock Incentive Plan | Employee Stock Option | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option exercise price as a percentage of grant date fair value 100.00%    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant under the plan | shares 300,000    
Discount from market price 15.00%    
Unrecognized compensation expense related to granted but unvested stock options $ 921 $ 841 $ 750
Non-Employee Restricted Stock | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated stock-based compensation expense $ 100 $ 100 $ 800
Shares granted | shares 62,000    
Shares of unvested restricted stock | shares 72,000 10,000 135,000
Award Modifications | Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated stock-based compensation expense $ 46 $ 85 $ 0
Number of employees affected by award modification | employee 2    
Award Modifications | Performance stock units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 90 days    
Award Modifications | Performance stock units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 180 days    
[1] Represents the total difference between the Company's stock price at the time of exercise and the stock option exercise price, multiplied by the number of options exercised.
[2] Shares granted in 2015 include 192,624 performance stock units that have certain performance conditions required to be achieved to vest.