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Stock-Based Compensation (Employee Stock Purchase Plan Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Number of Shares    
Stock-based compensation expense $ 6,239 $ 8,391
2014 Employee Stock Purchase Plan | Employee Stock    
Number of Shares    
Maximum employee subscription rate 10.00%  
Purchase price of common stock, percent 85.00%  
Number of Shares Reserved 1,479,751  
Increase in shares authorized, percent of outstanding stock 1.00%