FAIR VALUE OF FINANCIAL INSTRUMENTS (Table)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

	March 31, 2021				December 31, 2020
(In thousands)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
3.84% Senior notes due 2021	$	100,000	$	101,796	$	100,000	$	102,173
3.70% Senior notes due 2023	202,500		211,611		202,500		211,790
3.85% Senior notes due 2025	90,000		96,673		90,000		97,429
4.24% Senior notes due 2026	200,000		219,392		200,000		224,390
4.05% Senior notes due 2028	67,500		72,994		67,500		75,440
4.11% Senior notes due 2028	90,000		97,438		90,000		101,047
3.10% Senior notes due 2030	150,000		148,971		150,000		155,805
3.20% Senior notes due 2032	150,000		146,813		150,000		155,048
Total debt	1,050,000		1,095,688		1,050,000		1,123,122
Debt issuance costs, net	(1,084)		(1,084)		(1,147)		(1,147)
Unamortized interest rate swap proceeds	8,991		8,991		9,439		9,439
Total debt, net	$	1,057,907	$	1,103,595	$	1,058,292	$	1,131,414