DEBT (Narrative) (Details) $ in Thousands			3 Months Ended
		Apr. 10, 2020 USD ($) item	Mar. 31, 2020 USD ($) item	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Discounts and debt issuance costs			$ 1,258	$ 1,239
Total long-term debt - face value			2,846,367	2,846,390	$ 2,846,373
Short-term debt			$ 0	178,500	0
Term Loan Due April 2021 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Number of draws | item		2
Maturity year		2021
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
Commitment fee			0.15%
Available borrowing capacity			$ 695,871
Maturity year			2021
Borrowings			$ 0
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] | 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
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] | Subsequent Event [Member]
Debt Instrument [Line Items]
Commitment fee		0.25%
Short-term debt		$ 750,000
Maximum [Member] | Term Loan Due April 2021 [Member] | LIBOR [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate		2.125%
Maximum [Member] | Term Loan Due April 2021 [Member] | Base Rate [Member] | Subsequent Event [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] | Subsequent Event [Member]
Debt Instrument [Line Items]
Commitment fee		0.125%
Minimum [Member] | Term Loan Due April 2021 [Member] | LIBOR [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate		1.375%
Minimum [Member] | Term Loan Due April 2021 [Member] | Base Rate [Member] | Subsequent Event [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			$ 2,846,367
Notes [Member] | Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			2,846,188
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	[1]		$ 0	$ 0	$ 0
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.