ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Changes in Components of AOCI, Net of Related Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Balance, beginning	$ 1,887,436	$ 1,620,274	$ 1,716,757	$ 1,487,752
Other comprehensive loss, net of tax	(7,807)	(596)	(8,160)	(1,805)
Balance, ending	1,874,630	1,650,077	1,874,630	1,650,077
Accumulated Other Comprehensive Loss [Member]
Balance, beginning	(1,416)	5,755	(1,063)	6,964
Current period change, excluding amounts reclassified from accumulated other comprehensive income/(loss)	(5,913)	2,269	(1,692)	6,211
Amounts reclassified from accumulated other comprehensive income/(loss)	(1,894)	(2,865)	(6,468)	(8,016)
Other comprehensive loss, net of tax	(7,807)	(596)	(8,160)	(1,805)
Balance, ending	(9,223)	5,159	(9,223)	5,159
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance, beginning	8,924	16,155	9,349	16,912
Current period change, excluding amounts reclassified from accumulated other comprehensive income/(loss)	(2,383)	1,897	1,766	6,291
Amounts reclassified from accumulated other comprehensive income/(loss)	(1,894)	(2,865)	(6,468)	(8,016)
Balance, ending	4,647	15,187	4,647	15,187
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance, beginning	(10,340)	(10,400)	(10,412)	(9,948)
Current period change, excluding amounts reclassified from accumulated other comprehensive income/(loss)	(3,530)	372	(3,458)	(80)
Balance, ending	$ (13,870)	$ (10,028)	$ (13,870)	$ (10,028)