OTHER COMPREHENSIVE INCOME (Amounts Reclassified from Accumulated Other Comprehensive Income to Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (32,197)	$ (33,547)	$ (98,165)	$ (104,566)
Other nonoperating expense	359	4,890	5,954	12,708
Benefit from income taxes	53,472	40,663	111,764	75,805
Total	215,713	179,151	476,569	391,783
Reclassification From AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total	343	1,144	1,025	3,445
Interest Rate Hedge Losses [Member] | Reclassification From AOCI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	78	72	229	232
Benefit from income taxes	(21)	(19)	(60)	(61)
Total	57	53	169	171
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	386	1,477	1,159	4,430
Benefit from income taxes	(100)	(386)	(303)	(1,156)
Total	$ 286	$ 1,091	$ 856	$ 3,274