COMMITMENTS AND CONTINGENCIES - Narrative (Details)	1 Months Ended	12 Months Ended
	Jul. 31, 2019 USD ($) ft² renewal_option	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Total lease payments over term		$ 540,172,000
Finance lease obligation		0
Total rental expenses for operating leases		$ 80,300,000	$ 75,200,000	$ 32,500,000
Operating Lease Agreement | Affiliated Entity
Lessee, Lease, Description [Line Items]
Operating lease term	15 years 6 months
Operating lease renewal term	5 years
Leased area of office space (in sq ft) | ft²	226,185
Operating lease, number of renewal options | renewal_option	2
Total lease payments over term	$ 42,700,000
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, option to terminate leased space (up to)	0.50
Building
Lessee, Lease, Description [Line Items]
Operating lease renewal term		5 years
Operating lease option to terminate term		1 year
Building | Minimum
Lessee, Lease, Description [Line Items]
Operating lease term		1 year
Building | Maximum
Lessee, Lease, Description [Line Items]
Operating lease term		15 years