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Summary of Significant Accounting Policies - Leases (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Option
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]          
Variable lease expense and short-term lease expenses     $ 6,100 $ 6,200  
Weighted average discount rate 4.20%   4.20%   3.90%
Lease expense $ 8,000 $ 6,500 $ 21,400 18,300  
Weighted average remaining lease term 7 years 7 months 6 days   7 years 7 months 6 days   8 years 1 month 6 days
Rent paid to related parties $ 2,000 $ 700 $ 4,500 $ 2,700  
Existence of option to extend     true    
Summary of lease asset and liabilities          
Lease right-of-use assets 95,815   $ 95,815   $ 84,073
Operating Lease, Liability [Abstract]          
Other current liabilities $ 16,368   $ 16,368   14,016
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current   Other Liabilities, Current    
Long-term lease liabilities $ 81,638   $ 81,638   72,697
Present Value of Lease Liabilities $ 98,006   $ 98,006   $ 86,713
Minimum          
Lessee, Lease, Description [Line Items]          
Lease term 3 years   3 years    
Number of options to renew | Option     1    
Maximum          
Lessee, Lease, Description [Line Items]          
Lease term 10 years   10 years