Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective fair value hedge that is amortized upon discontinuation of the fair value hedge.

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The year the debt instrument is scheduled to be fully repaid.

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DEBT (Summary of Debt Additional Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2011	Jun. 30, 2013	Jan. 31, 2013
Debt Instrument [Line Items]
Interest rate				6.50%
6.30% notes due 2013
Debt Instrument [Line Items]
Interest rate					6.30%
10.125% notes due 2015
Debt Instrument [Line Items]
Interest rate	10.125%	10.125%
Maturity year	2015	2015
Increase in unamortized deferred gain realized	$ 1,068	$ 2,082
Decrease in unamortized discounts	95	185
Effective interest rate	9.58%
6.50% notes due 2016
Debt Instrument [Line Items]
Interest rate	6.50%	6.50%	6.50%
Maturity year	2016	2016	2016
Decrease in unamortized discounts	1,968	11,627
Effective interest rate	6.00%
6.40% notes due 2017
Debt Instrument [Line Items]
Interest rate	6.40%	6.40%	6.40%
Maturity year	2017	2017	2017
Decrease in unamortized discounts	44	93
Effective interest rate	7.39%
7.00% notes due 2018
Debt Instrument [Line Items]
Interest rate	7.00%	7.00%
Maturity year	2018	2018
Decrease in unamortized discounts	184	228
Effective interest rate	7.87%
10.375% notes due 2018
Debt Instrument [Line Items]
Interest rate	10.375%	10.375%
Maturity year	2018	2018
Decrease in unamortized discounts	970	1,157
Effective interest rate	10.625%
7.50% notes due 2021
Debt Instrument [Line Items]
Interest rate	7.50%	7.50%
Maturity year	2021	2021
Effective interest rate	7.75%
8.85% notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate	8.85%	8.85%
Maturity year	2021	2021
Effective interest rate	8.88%
Industrial revenue bonds
Debt Instrument [Line Items]
Maturity year	2022
7.15% notes due 2037
Debt Instrument [Line Items]
Interest rate	7.15%	7.15%
Maturity year	2037	2037
Decrease in unamortized discounts	$ 618	$ 627
Effective interest rate	8.05%
Medium-term Notes
Debt Instrument [Line Items]
Interest rate						8.70%