LEASES - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 4,950	$ 11,024	$ 9,500	$ 16,748
Sublease income	(93)	(175)	(186)	(276)
Net lease cost	$ 4,857	10,849	$ 9,314	16,472
Corporate Development Expense
Lessee, Lease, Description [Line Items]
Operating lease cost		$ 5,900		$ 8,000
Minimum
Lessee, Lease, Description [Line Items]
Lease term	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term	42 years		42 years