LEASES AND RELATED PARTY LEASES - Supplemental Balance Sheet Information (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Right of use asset - operating leases	$ 94,530
Current portion of lease liability - operating leases	12,253
Lease liability - operating leases	97,504
Total lease liabilities	$ 109,757
Leased facilities
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term (in years)	12 years 9 months 18 days
Weighted average discount rate	5.40%
Leased vehicles
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term (in years)	2 years 7 months 6 days
Weighted average discount rate	3.20%