INCOME TAXES - INCOME TAXES NARRATIVE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act of 2017, measurement period adjustment, income tax expense (benefit)			$ 19,500
Amount of unrecognized tax benefits that if recognized would affect the effective tax rate	$ 103,213	$ 102,671
Net tax expense (benefit) for interest and penalties	1,564	3,824	1,785
Accrued net interest and penalties	11,542	9,978
Expected reduction in the liability for unrecognized tax benefits within the next 12 months	6,803
Undistributed earnings of foreign subsidiaries	762,601
Investment tax credits and related tax depreciation benefits	146,021	58,798	60,111
Write-down of equity investments	125,579	50,457	50,329
Other Nonoperating Income (Expense) | Partnerships Qualifying For Tax Credits
Income Tax Contingency [Line Items]
Write-down of equity investments	$ 125,579	$ 50,457	$ 50,329