DEBT (Summary of Debt Additional Information) (Details) (USD $) In Thousands, unless otherwise specified		9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended				9 Months Ended			9 Months Ended
	Jun. 30, 2011	Sep. 30, 2014 10.125% notes due 2015	Dec. 31, 2013 10.125% notes due 2015	Sep. 30, 2013 10.125% notes due 2015	Sep. 30, 2014 6.50% notes due 2016	Dec. 31, 2013 6.50% notes due 2016	Sep. 30, 2013 6.50% notes due 2016	Sep. 30, 2014 6.40% notes due 2017	Dec. 31, 2013 6.40% notes due 2017	Sep. 30, 2013 6.40% notes due 2017	Sep. 30, 2014 7.00% notes due 2018	Dec. 31, 2013 7.00% notes due 2018	Sep. 30, 2013 7.00% notes due 2018	Sep. 30, 2014 10.375% notes due 2018	Dec. 31, 2013 10.375% notes due 2018	Sep. 30, 2013 10.375% notes due 2018	Sep. 30, 2014 7.50% notes due 2021	Sep. 30, 2014 7.15% notes due 2037	Dec. 31, 2013 7.15% notes due 2037	Sep. 30, 2013 7.15% notes due 2037	Sep. 30, 2014 Medium-term Notes	Jun. 30, 2013 Medium-term Notes	Jan. 31, 2013 Medium-term Notes	Sep. 30, 2014 Industrial revenue bonds
Debt Instrument [Line Items]
Interest rate	6.50%	10.125%			6.50%			6.40%			7.00%			10.375%			7.50%	7.15%			8.85%	6.30%	8.70%
Maturity year		2015			2016			2017			2018			2018			2021	2037			2021			2022
Increase in unamortized deferred gain realized		$ 1,330	$ 2,082	$ 2,315	$ 2,208	$ 11,627	$ 12,505
Decrease in unamortized discounts		$ 118	$ 185	$ 206				$ 48	$ 93	$ 98	$ 195	$ 228	$ 239	$ 1,019	$ 1,157	$ 1,201		$ 620	$ 627	$ 629
Effective interest rate		9.58%			6.00%			7.41%			7.87%			10.625%			7.75%	8.05%			8.88%