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Summary of Significant Accounting Policies - Commitments and Contingencies (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
ft²
Sep. 30, 2018
USD ($)
Accounting Policies [Abstract]        
Operating cash flows for lease liabilities     $ 42,167  
Square feet of office space | ft²     60,000  
Monthly rent payments     $ 100  
Rent expense     900  
Lease, Cost [Abstract]        
Operating Lease, Cost $ 16,358 $ 15,524 47,690 $ 45,308
Variable lease cost $ 3,335 $ 3,114 $ 9,942 $ 9,177
Weighted-average remaining lease term (years) 4 years 6 months 18 days   4 years 6 months 18 days  
Weighted-average discount rate 3.47%   3.47%  
Lessee, Operating Lease, Liability, Payment, Due [Abstract]        
2019 $ 9,563   $ 9,563  
2020 54,926   54,926  
2021 44,186   44,186  
2022 35,217   35,217  
2023 22,886   22,886  
Thereafter 25,472   25,472  
Total lease payments 192,250   192,250  
Less: interest 14,828   14,828  
Present value of lease liabilities $ 177,422   $ 177,422