COMMITMENTS AND CONTINGENCIES - Operating and Finance Leases Narrative (Details)	1 Months Ended	3 Months Ended
	Jul. 31, 2019 USD ($) ft² renewal_option	Mar. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Total lease payments over term		$ 550,495,000
Finance lease obligation		$ 0
Operating Lease Agreement | Affiliated Entity
Lessee, Lease, Description [Line Items]
Operating lease, number of renewal options | renewal_option	2
Operating lease renewal term	5 years
Leased area of office space (in sq ft) | ft²	226,185
Operating lease term	15 years 6 months
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 remaining term		1 year
Building | Maximum
Lessee, Lease, Description [Line Items]
Operating lease remaining term		16 years