COMMITMENTS AND CONTINGENCIES - Leases: Other Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 26,704	$ 23,098
Operating cash flows for finance leases	34	48
Financing cash flows for finance leases	463	412
Leased assets obtained in exchange for new finance lease liabilities	189	0
Leased assets obtained in exchange for new operating lease liabilities	$ 55,461	$ 12,477