Leases - Summary of Operating Leases (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 165,021
Amortization of right-of-use assets	(26,865)
Total operating lease right-of-use assets	138,156
Real Estate Facilities
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	162,873
Office Equipment
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	1,401
Other
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 747