DERIVATIVE INSTRUMENTS (Narrative) (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2011 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2007 USD ($) agreement	Jun. 30, 2011 USD ($)
Derivative [Line Items]
Number of forward starting interest rate swap agreements | agreement					15
Cash payments for interest rate swap agreements					$ 89,777,000
Amortized deferred gain		$ 0	$ 3,036,000	$ 10,674,000
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements					$ 1,500,000,000
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period		$ 2,179,000
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member] | Debt [Member]
Derivative [Line Items]
Loss reclassified from AOCI			7,208,000	3,762,000
Designated as Hedging Instrument [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Cash proceeds from interest rate swap agreements	$ 25,382,000
Amortized deferred gain			$ 1,642,000	$ 8,032,000
Fixed-Rate Notes [Member] | 6.50% notes due 2016 [Member]
Derivative [Line Items]
Fixed-rate notes issued						$ 500,000,000
Interest rate						6.50%
Fixed-Rate Notes [Member] | 10.125% notes due 2015 [Member]
Derivative [Line Items]
Interest rate						10.125%
Fixed-Rate Notes [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | 6.50% notes due 2016 [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements						$ 500,000,000
Fixed interest rate under swap agreements						6.50%
Fixed-Rate Notes [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | 10.125% notes due 2015 [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements						$ 150,000,000
Fixed interest rate under swap agreements						10.125%
LIBOR [Member] | Fixed-Rate Notes [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | 6.50% notes due 2016 [Member]
Derivative [Line Items]
Interest rate spread above London Interbank Offered Rate (LIBOR)						4.05%
LIBOR [Member] | Fixed-Rate Notes [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedges [Member] | Interest Rate Swap [Member] | 10.125% notes due 2015 [Member]
Derivative [Line Items]
Interest rate spread above London Interbank Offered Rate (LIBOR)						8.03%