Summary of Significant Accounting Policies - Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) Option	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Variable lease expense and short-term lease expenses	$ 1,900	$ 1,900
Weighted average discount rate	3.90%		3.90%
Lease expense	$ 6,400	5,600
Weighted average remaining lease term	7 years 9 months 18 days		8 years 1 month 6 days
Rent paid to related parties	$ 900	$ 1,200
Existence of option to extend	true
Summary of lease asset and liabilities
Lease right-of-use assets	$ 82,301		$ 84,073
Lease Liabilities
Other current liabilities	$ 14,515		14,016
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current
Long-term lease liabilities	$ 70,410		72,697
Present Value of Lease Liabilities	$ 84,925		$ 86,713
Minimum
Lessee, Lease, Description [Line Items]
Lease term	3 years
Number of options to renew | Option	1
Maximum
Lessee, Lease, Description [Line Items]
Lease term	10 years