LONG-TERM DEBT (Schedule of Debt) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Jul. 01, 2020
Debt Instrument [Line Items]
Total face amount of long-term debt	$ 1,000,000,000	$ 1,000,000,000
Senior Notes unamortized discount and issuance costs	(12,367,000)	(13,285,000)
Long-term debt, net	987,633,000	986,715,000
2.800% Senior Notes due July 15, 2030
Debt Instrument [Line Items]
Stated interest rate			2.80%
Total face amount of long-term debt	1,000,000,000	1,000,000,000	$ 1,000,000,000
2020 Credit Agreement, due July 1, 2025
Debt Instrument [Line Items]
Total face amount of long-term debt	$ 0	$ 0