DEBT (Debt) (Details) - USD ($) $ in Thousands		1 Months Ended	6 Months Ended
		May 31, 2020	Jun. 30, 2020	Apr. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Debt Instrument [Line Items]
Total short-term debt			$ 0		$ 0	$ 137,000
Total long-term debt - face value			3,355,341		2,846,373	2,846,385
Unamortized discounts and debt issuance costs			(69,669)		(62,033)	(64,535)
Total long-term debt - book value			3,285,672		2,784,340	2,781,850
Less current maturities			500,026		25	24
Total long-term debt - reported value			2,785,646		2,784,315	2,781,826
Estimated fair value of long-term debt			$ 3,225,468		3,073,693	2,898,283
Term Loan Due [Member]
Debt Instrument [Line Items]
Maturity year			2021
Term Loan Due [Member] | Term Loan Due April 2021 [Member]
Debt Instrument [Line Items]
Total short-term debt			$ 0		0	0
Maturity year			2021
Term Loan Due [Member] | Term Loan Due April 2021 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Total short-term debt				$ 750,000
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Maturity year	[1]		2021
Bank Line of Credit [Member] | Bank Line Of Credit Due 2021 [Member]
Debt Instrument [Line Items]
Total short-term debt	[1]		$ 0		0	137,000
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Maturity year	[1]		2021
Bank Line of Credit [Member] | Bank Line Of Credit Due 2021 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	[1]		$ 0		0	0
Notes [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			3,355,341
Notes [Member] | Floating-Rate Notes Due 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		$ 250,000	$ 0		250,000	250,000
Maturity year			2020
Notes [Member] | Floating-Rate Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 500,000		500,000	500,000
Maturity year			2021
Effective interest rate			1.21%
Notes [Member] | 8.85% notes due 2021 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 6,000		6,000	6,000
Interest rate			8.85%
Maturity year			2021
Effective interest rate			8.88%
Notes [Member] | 4.50% notes due 2025 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 400,000		400,000	400,000
Interest rate			4.50%
Maturity year			2025
Effective interest rate			4.65%
Notes [Member] | 3.90% notes due 2027 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 400,000		400,000	400,000
Interest rate			3.90%
Maturity year			2027
Effective interest rate			4.00%
Notes [Member] | 3.50% notes due 2030 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		$ 750,000	$ 750,000		0	0
Interest rate		3.50%	3.50%
Maturity year		2030	2030
Effective interest rate			3.91%
Notes [Member] | 7.15% notes due 2037 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 129,239		129,239	129,239
Interest rate			7.15%
Maturity year			2037
Effective interest rate			8.05%
Notes [Member] | 4.50% notes due 2047 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 700,000		700,000	700,000
Interest rate			4.50%
Maturity year			2047
Effective interest rate			4.59%
Notes [Member] | 4.70% notes due 2048 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 460,949		460,949	460,949
Interest rate			4.70%
Maturity year			2048
Effective interest rate			5.42%
Other Notes [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 9,153		$ 185	$ 197
Effective interest rate			1.10%

[1] Borrowings on the bank line of credit are classified as short-term if we intend to repay within twelve months and as long-term if we have the intent and ability to extend payment beyond twelve months.