DERIVATIVE INSTRUMENTS (Narrative) (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2011 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2007 USD ($) agreement	Dec. 31, 2016 USD ($)	Apr. 30, 2015	Mar. 31, 2014	Jun. 30, 2011 USD ($)
Derivative [Line Items]
Number of forward starting interest rate swap agreements | agreement					15
Cash (payments for) proceeds from interest rate swap agreements	$ 25,382,000				$ (89,777,000)
Fixed-rate notes issued		$ 2,004,198,000	$ 2,004,459,000						$ 500,000,000
Gain component of the settlement	23,387,000
Accrued interest	$ 1,995,000
Amortized deferred gain		3,036,000	10,674,000	$ 4,334,000
Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative [Line Items]
Loss reclassified from AOCI		$ 7,208,000	$ 3,762,000
6.50% notes due 2016 [Member]
Derivative [Line Items]
Interest rate		6.50%	6.50%				6.50%	6.50%	6.50%
10.125% notes due 2015 [Member]
Derivative [Line Items]
Interest rate		10.125%	10.125%
Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements					$ 1,500,000,000
Interest Rate Swap Agreement One [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements									$ 500,000,000
Interest rate spread above London Interbank Offered Rate (LIBOR)									4.05%
Fixed interest rate under swap agreements									6.50%
Interest Rate Swap Agreement Two [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements									$ 150,000,000
Interest rate spread above London Interbank Offered Rate (LIBOR)									8.03%
Fixed interest rate under swap agreements									10.125%
Interest Rate Swap Agreement Two [Member] | 10.125% notes due 2015 [Member]
Derivative [Line Items]
Interest rate									10.125%
Debt [Member]
Derivative [Line Items]
Amortized deferred gain		$ 1,642,000	$ 8,032,000
Scenario, Forecast [Member]
Derivative [Line Items]
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period						$ 2,008,000