Leases - Summary of Operating Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 135,144
Amortization of right-of-use assets	(7,557)
Total operating lease right-of-use assets	127,587
Real Estate Facilities
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	132,596
Office Equipment
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	2,062
Other
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 486