DEBT (Summary of Debt Additional Information) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2011	Sep. 30, 2013 5.60% notes due 2012	Dec. 31, 2012 5.60% notes due 2012	Sep. 30, 2012 5.60% notes due 2012	Sep. 30, 2013 6.30% notes due 2013	Dec. 31, 2012 6.30% notes due 2013	Sep. 30, 2012 6.30% notes due 2013	Sep. 30, 2013 10.125% notes due 2015	Dec. 31, 2012 10.125% notes due 2015	Sep. 30, 2012 10.125% notes due 2015	Sep. 30, 2013 6.50% notes due 2016	Dec. 31, 2012 6.50% notes due 2016	Sep. 30, 2012 6.50% notes due 2016	Sep. 30, 2013 6.40% notes due 2017	Dec. 31, 2012 6.40% notes due 2017	Sep. 30, 2012 6.40% notes due 2017	Sep. 30, 2013 7.00% notes due 2018	Dec. 31, 2012 7.00% notes due 2018	Sep. 30, 2012 7.00% notes due 2018	Sep. 30, 2013 10.375% notes due 2018	Dec. 31, 2012 10.375% notes due 2018	Sep. 30, 2012 10.375% notes due 2018	Sep. 30, 2013 7.50% notes due 2021	Dec. 31, 2012 7.50% notes due 2021	Sep. 30, 2012 7.50% notes due 2021	Sep. 30, 2013 7.15% notes due 2037	Dec. 31, 2012 7.15% notes due 2037	Sep. 30, 2012 7.15% notes due 2037
Debt Instrument [Line Items]
Interest rate	5.60%	6.50%	5.60%	5.60%	5.60%	6.30%	6.30%	6.30%	10.125%	10.125%	10.125%	6.50%	6.50%	6.50%	6.40%	6.40%	6.40%	7.00%	7.00%	7.00%	10.375%	10.375%	10.375%	7.50%	7.50%	7.50%	7.15%	7.15%	7.15%
Maturity year			2012	2012	2012	2013	2013	2013	2015	2015	2015	2016	2016	2016	2017	2017	2017	2018	2018	2018	2018	2018	2018	2021	2021	2021	2037	2037	2037
Decrease in unamortized discounts					$ 9		$ 30	$ 46	$ 206	$ 265	$ 284				$ 98	$ 112	$ 117	$ 239	$ 269	$ 279	$ 1,201	$ 1,324	$ 1,363				$ 629	$ 635	$ 637
Effective interest rate									9.59%	9.59%	9.59%	6.02%	6.02%	6.02%	7.41%	7.41%	7.41%	7.87%	7.87%	7.87%	10.62%	10.62%	10.62%	7.75%	7.75%	7.75%	8.05%	8.05%	8.05%
Increase (decrease) in unamortized deferred gain realized									$ 2,315	$ 2,983	$ 3,195	$ 12,505	$ 15,060	$ 15,887