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Stock-Based Compensation (Employee Stock Purchase Plan Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Reserved 12,464,864    
Stock-based compensation expense $ 30,584 $ 23,846 $ 6,352
Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 6 months    
Expected volatility 48.00%    
Dividend yield 0.00%    
Risk-free interest rate 0.33%    
2014 Employee Stock Purchase Plan | Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum employee subscription rate 10.00%    
Purchase price of common stock, percent 85.00%    
Number of Shares Reserved 727,565    
Increase in shares authorized, percent of outstanding stock 1.00%    
Issuance of common stock related to employee stock purchase plan (in shares) 169,362    
Unrecognized employee stock-based compensation $ 500