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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 01, 2016
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance (in shares)   2,600,000  
Stock-based compensation expense   $ 3,797 $ 3,413
Unrecognized compensation expense   $ 28,000  
Granted (shares)   76,034  
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  
Stock-based compensation expense   $ 300 $ 400
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance (in shares)   1,900,000  
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Actual payout   97.00%  
Awarded (shares)   117,829  
Performance Stock Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target payout opportunities   0.00%  
Performance Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target payout opportunities   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)   $ 12.19 $ 6.54
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awarded (shares)   325,703