DEBT (Narrative) (Details) - USD ($)		1 Months Ended			3 Months Ended	6 Months Ended
		Jul. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Discounts and debt issuance costs						$ 2,233,000
Total long-term debt - face value			$ 3,369,058,000			3,369,058,000	$ 2,004,189,000	$ 2,004,065,000
Repayments of debt		$ 565,559,000
Proceeds from issuance of long-term debt						1,600,000,000	0
Repayment of line of credit						235,007,000	9,000
Premium for repayments of debt		43,020,000
Transaction costs for repayments of debt		$ 27,000
Forecast [Member]
Debt Instrument [Line Items]
Net noncash expense					$ 3,029,000
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			750,000,000			$ 750,000,000
Commitment fee						0.15%
Available borrowing capacity			706,462,000			$ 706,462,000
Borrowings			0			$ 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			43,538,000			$ 43,538,000
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%
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%
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%
Notes [Member]
Debt Instrument [Line Items]
Face value			1,000,000,000			$ 1,000,000,000
Net proceeds			989,512,000
Notes [Member] | 3.90% notes due 2027 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			400,000,000			400,000,000	0	0
Face value			$ 400,000,000			$ 400,000,000
Interest rate			3.90%	3.90%		3.90%
Net proceeds				$ 345,450,000
Notes [Member] | 3.90% notes due 2027 [Member] | June 2017 Issuance [Member]
Debt Instrument [Line Items]
Face value			$ 50,000,000			$ 50,000,000
Notes [Member] | 3.90% notes due 2027 [Member] | March 2017 Issuance [Member]
Debt Instrument [Line Items]
Face value				$ 350,000,000
Notes [Member] | Delayed draw term loan [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	[1],[2]		250,000,000			250,000,000	0	0
Notes [Member] | Delayed draw term loan [Member] | Quarters 5 - 8 [Member]
Debt Instrument [Line Items]
Required periodic principal payment						1,562,500
Notes [Member] | Delayed draw term loan [Member] | Quarters 9 - 12 [Member]
Debt Instrument [Line Items]
Required periodic principal payment						3,125,000
Notes [Member] | Delayed draw term loan [Member] | Quarters 13 - 19 [Member]
Debt Instrument [Line Items]
Required periodic principal payment						4,687,500
Notes [Member] | Delayed draw term loan [Member] | Quarter 20 [Member]
Debt Instrument [Line Items]
Required periodic principal payment						198,437,500
Notes [Member] | Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			3,118,700,000			3,118,700,000
Notes [Member] | 4.50% notes due 2047 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			700,000,000			700,000,000	0	0
Face value			$ 700,000,000			$ 700,000,000
Interest rate			4.50%			4.50%
Notes [Member] | Floating-Rate Notes Due 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 250,000,000			$ 250,000,000	0	0
Face value			250,000,000			250,000,000
Notes [Member] | 10.375% notes due 2018 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 250,000,000			$ 250,000,000	250,000,000	250,000,000
Interest rate			10.375%			10.375%
Notes [Member] | 7.00% notes due 2018 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 272,512,000			$ 272,512,000	272,512,000	272,512,000
Interest rate			7.00%			7.00%
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Maturity date						Dec. 31, 2021
Total long-term debt - face value	[1],[2],[3]		$ 0			$ 0	$ 235,000,000	$ 235,000,000

[1] Non-publicly traded debt.

[2] The effective interest rate is the spread over LIBOR as of the most recent balance sheet date.

[3] Borrowings on the bank line of credit are classified as short-term debt if we intend to repay within twelve months and as long-term debt otherwise.