OTHER COMPREHENSIVE INCOME (Amounts Reclassified from Accumulated Other Comprehensive Income to Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (33,954)	$ (33,035)	$ (64,727)	$ (65,969)
Other nonoperating expense	7,367	2,466	(1,969)	5,595
Benefit from income taxes	61,352	47,598	73,546	58,291
Total	209,916	197,558	270,174	260,857
Reclassification From AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total	1,889	392	4,378	682
Interest Rate Hedge Losses [Member] | Reclassification From AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	263	76	1,337	151
Benefit from income taxes	(69)	(20)	(349)	(40)
Total	194	56	988	111
Pension and Postretirement Plan Actuarial Loss and Prior Service Cost [Member] | Reclassification From AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other nonoperating expense	2,294	386	4,587	772
Benefit from income taxes	(599)	(50)	(1,197)	(201)
Total	$ 1,695	$ 336	$ 3,390	$ 571