DEBT (Summary of Debt Additional Information) (Details) - USD ($)		1 Months Ended	3 Months Ended	6 Months Ended
		Apr. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2011
Debt Instrument [Line Items]
Debt instrument face amount				$ 2,004,189,000	$ 2,004,198,000	$ 2,071,813,000
10.125% notes due 2015 [Member]
Debt Instrument [Line Items]
Interest rate				10.125%			10.125%
Maturity year				2015
6.50% notes due 2016 [Member]
Debt Instrument [Line Items]
Interest rate		6.50%		6.50%			6.50%
Maturity year		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%
Maturity year		2017		2017
7.00% notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate		7.00%	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
Debt instrument face amount			$ 400,000,000
Effective interest rate				4.65%
7.15% notes due 2037 [Member]
Debt Instrument [Line Items]
Interest rate				7.15%
Maturity year				2037
Effective interest rate				8.05%
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit, expiration date				Jun. 01, 2020
Bank Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit, expiration date				Jun. 01, 2020
Effective interest rate	[1],[2],[3]			1.25%
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Maturity year				2022
Other Notes [Member]
Debt Instrument [Line Items]
Effective interest rate	[2]			6.24%

[1] 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.

[2] Non-publicly traded debt.

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