DEBT (Summary of Debt Additional Information) (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
		Apr. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2011
Debt Instrument [Line Items]
Debt Instrument Face Amount					$ 2,004,203,000	$ 2,004,459,000	$ 2,004,575,000
10.125% notes due 2015 [Member]
Debt Instrument [Line Items]
Interest rate					10.125%			10.125%
Maturity year					2015
Effective interest rate	[1]				9.58%
6.50% notes due 2016 [Member]
Debt Instrument [Line Items]
Interest rate		6.50%		6.50%	6.50%			6.50%
Maturity year		2016		2016	2016
Debt Instrument Face Amount								$ 500,000,000
6.40% notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate		6.40%		6.40%	6.40%
Maturity year		2017		2017	2017
7.00% notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate		7.00%			7.00%
Maturity year		2018	2018		2018
Effective interest rate					7.87%
10.375% notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate					10.375%
Maturity year					2018
Effective interest rate					10.63%
7.50% notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate					7.50%
Maturity year					2021
Effective interest rate					7.75%
8.85% notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate					8.85%
Maturity year					2021
Effective interest rate					8.88%
4.50% notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate			4.50%		4.50%
Maturity year			2025		2025
Effective interest rate					4.65%
Debt Instrument Face Amount			$ 400,000,000
7.15% notes due 2037 [Member]
Debt Instrument [Line Items]
Interest rate					7.15%
Maturity year					2037
Effective interest rate					8.05%
Other Notes
Debt Instrument [Line Items]
Effective interest rate	[2]				6.25%
Industrial revenue bonds [Member]
Debt Instrument [Line Items]
Maturity year					2022
Bank line of Credit [Member]
Debt Instrument [Line Items]
Effective interest rate	[2],[3],[4]				1.75%

[1] The 10.125% notes due 2015 are classified as long-term debt (not current maturities) as of September 30, 2015 due to our intent and ability to refinance these notes at maturity (December 15, 2015) using our line of credit.

[2] Non-publicly traded debt.

[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.

[4] The effective interest rate is the current credit spread over LIBOR.