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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for future issuance (in shares)   2,500,000   2,500,000  
Stock-based compensation expense   $ 3,800 $ 3,200 $ 7,589 $ 6,609
Unrecognized compensation expense   $ 25,000   $ 25,000  
Granted (shares)       90,618  
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Purchase price of common stock, percent       85.00%  
Employee stock purchase plan purchase period       6 months  
Shares available for future issuance (in shares)   800,000   800,000  
Stock-based compensation expense   $ 300 $ 300 $ 600 $ 700
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for future issuance (in shares)   2,100,000   2,100,000  
Performance Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by Share-based payment Award, performance period 3 years        
Actual payout   97.00%   97.00%  
Awarded (shares)       125,565  
Performance Stock Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Target payout opportunities   0.00%   0.00%  
Performance Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Target payout opportunities   200.00%   200.00%  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date fair value of options (in dollars per share)   $ 12.64 $ 7.51 $ 12.26 $ 6.57
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awarded (shares)       325,703  
Restricted Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awarded (shares)       33,460