DEBT (Narrative) (Details) $ in Thousands		1 Months Ended			3 Months Ended	6 Months Ended
		Jun. 30, 2020 USD ($)	May 31, 2020 USD ($)	Apr. 30, 2020 USD ($) item	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Discounts and debt issuance costs						$ 3,126	$ 2,482
Total long-term debt - face value		$ 3,355,341			$ 3,355,341	3,355,341	2,846,385	$ 2,846,373
Net proceeds			$ 741,417
Repayment of long-term debt						250,012	11
Short-term debt		0			0	0	137,000	0
Proceeds from issuance of long-term debt						$ 750,000	0
Term Loan Due [Member]
Debt Instrument [Line Items]
Maturity year						2021
Term Loan Due April 2021 [Member]
Debt Instrument [Line Items]
Commitment fee						0.175%
Term Loan Due April 2021 [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Available borrowing capacity		500,000			500,000	$ 500,000
Number of draws | item				2
Maturity year						2021
Repayments of debt					250,000
Short-term debt		0			0	$ 0	0	0
Borrowing end date						October 2020
Term Loan Due April 2021 [Member] | LIBOR [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						1.625%
Term Loan Due April 2021 [Member] | Base Rate [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						0.625%
Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Number of indentures with customary investment-grade type covenants | item						3
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		750,000			750,000	$ 750,000
Commitment fee						0.15%
Maturity year						2021
Bank Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						1.25%
Bank Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						0.25%
Bank Line of Credit [Member] | Delayed Draw Term Loan And Line Of Credit [Member]
Debt Instrument [Line Items]
Available borrowing capacity		1,195,871			1,195,871	$ 1,195,871
Short-term debt		0			0	$ 0
Bank Line of Credit [Member] | Maximum, Upon Certain Acquisitions [Member]
Debt Instrument [Line Items]
Debt to EBITDA ratio						3.75
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Outstanding standby letters of credit		54,129			54,129	$ 54,129
Period of standby letters of credit						1 year
Standby Letters of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						0.175%
Maximum [Member] | Term Loan Due April 2021 [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Commitment fee				0.25%
Short-term debt				$ 750,000
Maximum [Member] | Term Loan Due April 2021 [Member] | LIBOR [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate				2.125%
Maximum [Member] | Term Loan Due April 2021 [Member] | Base Rate [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate				1.125%
Maximum [Member] | Bank Line of Credit [Member]
Debt Instrument [Line Items]
Debt to EBITDA ratio						3.5
Commitment fee						0.25%
Maximum [Member] | Bank Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						1.75%
Maximum [Member] | Bank Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						0.75%
Minimum [Member] | Term Loan Due April 2021 [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Commitment fee				0.125%
Minimum [Member] | Term Loan Due April 2021 [Member] | LIBOR [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate				1.375%
Minimum [Member] | Term Loan Due April 2021 [Member] | Base Rate [Member] | Term Loan Due [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate				0.375%
Minimum [Member] | Bank Line of Credit [Member]
Debt Instrument [Line Items]
EBITDA to net cash interest expense ratio						3.0
Commitment fee						0.10%
Minimum [Member] | Bank Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						1.00%
Minimum [Member] | Bank Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate						0.00%
Notes [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		3,355,341			3,355,341	$ 3,355,341
Notes [Member] | Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		3,346,188			3,346,188	3,346,188
Notes [Member] | 3.50% notes due 2030 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		$ 750,000	$ 750,000		$ 750,000	$ 750,000	0	0
Maturity year			2030			2030
Interest rate		3.50%	3.50%		3.50%	3.50%
Notes [Member] | Floating-Rate Notes Due 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		$ 0	$ 250,000		$ 0	$ 0	250,000	250,000
Maturity year						2020
Repayment of long-term debt		250,000
Notes [Member] | Floating-Rate Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		500,000			500,000	$ 500,000	$ 500,000	$ 500,000
Maturity year						2021
Face value		$ 500,000			$ 500,000	$ 500,000
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Maturity year	[1]					2021

[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.