INCOME TAXES - INCOME TAXES NARRATIVE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense			$ 32,500
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	$ 102,671	93,507
Net tax expense (benefit) for interest and penalties	3,824	1,785	795
Accrued net interest and penalties	9,978	6,154
Expected reduction in the liability for unrecognized tax benefits within the next 12 months	13,534
Undistributed earnings of foreign subsidiaries	726,024
Investment tax credits and related tax depreciation benefits	58,798	60,111	74,600
Write-down of equity investments in partnerships qualifying for tax credits	50,457	50,329	66,209
Other Nonoperating Income (Expense) | Partnerships Qualifying For Tax Credits
Income Tax Contingency [Line Items]
Write-down of equity investments in partnerships qualifying for tax credits	$ 50,457	$ 50,329	$ 66,209