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Stock-Based Compensation (Employee Stock Purchase Plan Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares      
Number of Shares Reserved 12,116,233    
Stock-based compensation expense $ 28,694 $ 30,584 $ 23,846
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 985,968    
Increase in shares authorized, percent of outstanding stock 1.00%