DERIVATIVE INSTRUMENTS (Narrative) (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2011 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2007 USD ($) agreement	Sep. 30, 2016 USD ($)	Apr. 30, 2015	Dec. 31, 2014 USD ($)	Mar. 31, 2014	Jun. 30, 2011 USD ($)
Derivative Disclosure [Line Items]
Number of forward starting interest rate swap agreements | agreement						15
Payments for (Proceeds from) settlement of interest rate swap agreements	$ 25,382,000					$ 89,777,000
Loss reclassified from AOCI				$ 7,208,000	$ 3,762,000
Long-term notes issued		$ 2,004,203,000	$ 2,004,575,000	2,004,203,000	2,004,575,000				$ 2,004,459,000
Forward component of the settlement	23,387,000
Accrued interest income	$ 1,995,000
Amortized deferred gain		$ 282,000	$ 493,000	$ 2,795,000	10,171,000
6.50% notes due 2016 [Member]
Derivative Disclosure [Line Items]
Long-term notes issued											$ 500,000,000
Interest rate		6.50%		6.50%				6.50%		6.50%	6.50%
10.125% notes due 2015 [Member]
Derivative Disclosure [Line Items]
Interest rate		10.125%		10.125%							10.125%
Interest Rate Swap Agreements [Member]
Derivative Disclosure [Line Items]
Derviative, notional amount						$ 1,500,000,000
Interest Rate Swap Agreement One [Member]
Derivative Disclosure [Line Items]
Derviative, notional amount											$ 500,000,000
Interest rate spread above London Interbank Offered Rate (LIBOR)											4.05%
Fixed interest rate under swap agreement											6.50%
Interest Rate Swap Agreement Two [Member]
Derivative Disclosure [Line Items]
Derviative, notional amount											$ 150,000,000
Interest rate spread above London Interbank Offered Rate (LIBOR)											8.03%
Fixed interest rate under swap agreement											10.125%
Debt [Member]
Derivative Disclosure [Line Items]
Amortized deferred gain				$ 1,642,000	$ 8,032,000
Scenario, Forecast [Member]
Derivative Disclosure [Line Items]
Estimated amount of pretax loss in AOCI related to interest rate swap that would be reclassified to earnings within the next 12 months							$ 1,967,000