Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation Plans and Awards - ESPP, Employee Stock Based Awards, Stock Options, Restricted Stock Units Narrative (Details)

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Stock-based Compensation Plans and Awards - ESPP, Employee Stock Based Awards, Stock Options, Restricted Stock Units Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stock-based Compensation Plans and Awards        
Stock-based compensation expense $ 32,754 $ 28,794 $ 103,841 $ 79,473
Employee stock        
Stock-based Compensation Plans and Awards        
Percentage of eligible compensation to purchase common stock through payroll deductions (as a percent) 15.00%   15.00%  
Offering period     6 months  
Contributions from employees withheld $ 2,600 1,800 $ 6,400 5,100
Stock-based compensation expense $ 900 $ 600 $ 2,300 $ 1,900
Common stock issued (in shares) 643,562 255,432 1,254,910 538,398
Stock options        
Stock-based Compensation Plans and Awards        
Stock-based compensation expense $ 2,200 $ 2,300 $ 11,300 $ 7,500
Options granted (in shares) 0 0 0 0
Restricted stock units        
Stock-based Compensation Plans and Awards        
Stock-based compensation expense $ 28,200 $ 25,400 $ 87,200 $ 69,100
Vesting period     4 years