LEASES - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) asset_class	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Number of classes of leased assets-real estate properties | asset_class	4
Operating lease right-of-use assets	$ 67,296	$ 72,679	$ 0
Operating lease liabilities	$ 67,313	72,416
Remaining lease term	4 years 10 months 6 days
Lease extension period	14 years
Chief Executive Officer
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 1,900
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets		72,000
Operating lease liabilities		$ 72,000
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 month
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	12 years