DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($)	1 Months Ended
	May 31, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period			$ 1,959,000
Interest rate hedges			(23,943,000)	$ (10,953,000)	$ (11,180,000)
Total long-term debt - face value			3,357,899,000	2,846,373,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Cash payments for interest rate swap agreements		$ 19,863,000
Interest rate reclassified to interest expense, ineffective portion		$ 993,000
Notes [Member]
Derivative [Line Items]
Total long-term debt - face value			3,357,899,000
Notes [Member] | 3.50% notes due 2030 [Member]
Derivative [Line Items]
Period of debt	10 years
Total long-term debt - face value	$ 750,000,000		$ 750,000,000	$ 0
Interest rate	3.50%		3.50%