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	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Jun. 30, 2011	Dec. 31, 2014
Debt Instrument [Line Items]
Interest rate				6.50%
10.125% notes due 2015 [Member]
Debt Instrument [Line Items]
Interest rate	10.125%		10.125%
Maturity year	2015
Increase in unamortized deferred gain realized	$ 799	$ 1,837	$ 799		$ 1,068
Decrease in unamortized discounts	71	163	71		95
Effective interest rate	9.575%		9.575%
6.50% notes due 2016 [Member]
Debt Instrument [Line Items]
Interest rate	6.50%	6.50%	6.50%
Maturity year	2016	2016
Increase in unamortized deferred gain realized	1,724	2,677	1,724		1,968
Effective interest rate	6.00%		6.00%
6.40% notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate	6.40%	6.40%	6.40%
Maturity year	2017	2017
Decrease in unamortized discounts	41	55	41		44
Effective interest rate	7.39%		7.39%
7.00% notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate	7.00%		7.00%
Maturity year	2018		2018
Decrease in unamortized discounts	117	217	117		184
Effective interest rate	7.87%		7.87%
10.375% notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate	10.375%		10.375%
Maturity year	2018
Decrease in unamortized discounts	920	1,112	920		970
Effective interest rate	10.625%		10.625%
7.50% notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate	7.50%		7.50%
Maturity year	2021
Effective interest rate	7.75%		7.75%
8.85% notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate	8.85%		8.85%
Maturity year	2021
Effective interest rate	8.88%		8.88%
Industrial revenue bonds [Member]
Debt Instrument [Line Items]
Maturity year	2022
4.50% notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate	4.50%		4.50%
Maturity year	2025
Effective interest rate	4.65%		4.65%
7.15% notes due 2037 [Member]
Debt Instrument [Line Items]
Interest rate	7.15%		7.15%
Maturity year	2037
Decrease in unamortized discounts	$ 615	$ 624	$ 615		$ 618
Effective interest rate	8.05%		8.05%