LEASES - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) finance_lease operating_lease	Jan. 01, 2021 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Number of operating leases | operating_lease	144
Number of finance leases | finance_lease	1
Termination period of operating leases	1 year
Weighted average discount rate used for operating leases (as a percent)	4.27%
Weighted average discount rate used for finance leases (as a percent)	0.00%
Finance lease liability	$ 0		$ 35,000
Number of lease agreements not yet commenced | operating_lease	1
Operating lease right-of-use assets	$ 22,243,000		23,116,000
Operating lease liability	$ 22,413,000		$ 23,213,000
Quebec, Canada | Forecast
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets		$ 2,500,000
Operating lease liability		$ 2,500,000
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term of operating leases	13 years
Renewal term of operating leases	7 years
Minimum
Lessee, Lease, Description [Line Items]
Renewal term of operating leases	1 year