COMMITMENTS AND CONTINGENCIES - Other Lease Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Weighted-average discount rate		3.70%
Cash paid for amounts included in the measurement of lease liabilities		$ 4,483
Right of use assets obtained in exchange for new lease liabilities		15,280
Existing Leases
Lessee, Lease, Description [Line Items]
Right of use assets obtained in exchange for new lease liabilities	$ 12,600
Commenced Leases
Lessee, Lease, Description [Line Items]
Right of use assets obtained in exchange for new lease liabilities		$ 2,700