Leases - Summary of Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 162,693	$ 164,680
Amortization of right-of-use assets	(24,111)	(30,715)
Total operating lease right-of-use assets	138,582	133,965
Real Estate Facilities
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	160,299	162,150
Office Equipment
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	1,898	1,595
Other
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 496	$ 935