COMMITMENTS AND CONTINGENCIES - Leases: Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 37,500	$ 32,121	$ 31,509
Operating cash flows for finance leases	39	53	58
Financing cash flows for finance leases	535	460	311
Leased assets obtained in exchange for new finance lease liabilities	189	0	778
Leased assets obtained in exchange for new operating lease liabilities	$ 57,624	$ 36,935	$ 49,833