DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	May 31, 2020	Mar. 31, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Derivative [Line Items]
Interest rate hedges				$ (24,294)	$ (10,953)	$ (11,011)
Total long-term debt - face value				3,357,906	2,846,373	2,846,378
3.50% notes due 2030 [Member]
Derivative [Line Items]
Period of debt	10 years
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Cash payments for interest rate swap agreements		$ 19,863
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period				(1,937)
Interest rate reclassified to interest expense, ineffective portion			$ 993
Notes [Member]
Derivative [Line Items]
Total long-term debt - face value				3,357,906
Notes [Member] | 3.50% notes due 2030 [Member]
Derivative [Line Items]
Total long-term debt - face value	$ 750,000			$ 750,000	$ 0	$ 0
Interest rate	3.50%			3.50%