Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation Plans and Awards - ESPP Narrative (Details)

v3.10.0.1
Stock-based Compensation Plans and Awards - ESPP Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 28,838 $ 30,101 $ 82,802 $ 98,327
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
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 $ 1,900 1,900 $ 5,500 8,000
Stock-based compensation expense $ 900 $ 1,000 $ 2,500 $ 2,900
Common stock issued (in shares) 739,922 855,415 1,651,405 1,287,687