LEASES - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Operating leases, rental expense	$ 37.5
Minimum
Lessee, Lease, Description [Line Items]
Operating lease term		1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease term		15 years
Buildings
Lessee, Lease, Description [Line Items]
Operating lease term		6 years
Operating lease renewal term		68 months
Vehicles | Minimum
Lessee, Lease, Description [Line Items]
Operating lease term		1 year
Vehicles | Maximum
Lessee, Lease, Description [Line Items]
Operating lease term		7 years
Equipment | Minimum
Lessee, Lease, Description [Line Items]
Operating lease term		1 year
Equipment | Maximum
Lessee, Lease, Description [Line Items]
Operating lease term		6 years