DEBT (Summary of Debt Additional Information) (Details) (USD $) In Thousands, unless otherwise specified		6 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2013 10.125% notes due 2015	Jun. 30, 2014 10.125% notes due 2015	Dec. 31, 2013 10.125% notes due 2015	Jun. 30, 2014 6.50% notes due 2016	Jun. 30, 2013 6.50% notes due 2016	Dec. 31, 2013 6.50% notes due 2016	Jun. 30, 2014 6.40% notes due 2017	Jun. 30, 2013 6.40% notes due 2017	Dec. 31, 2013 6.40% notes due 2017	Jun. 30, 2013 7.00% notes due 2018	Jun. 30, 2014 7.00% notes due 2018	Dec. 31, 2013 7.00% notes due 2018	Jun. 30, 2013 10.375% notes due 2018	Jun. 30, 2014 10.375% notes due 2018	Dec. 31, 2013 10.375% notes due 2018	Jun. 30, 2013 7.50% notes due 2021	Jun. 30, 2014 7.50% notes due 2021	Jun. 30, 2013 7.15% notes due 2037	Jun. 30, 2014 7.15% notes due 2037	Dec. 31, 2013 7.15% notes due 2037
Debt Instrument [Line Items]
Interest rate	6.50%	10.125%			6.50%	6.50%		6.40%	6.40%		7.00%			10.375%			7.50%		7.15%
Maturity year		2015			2016	2016		2017	2017		2018			2018			2021		2037
Increase in unamortized deferred gain realized		$ 2,543	$ 1,587	$ 2,082	$ 2,444	$ 13,369	$ 11,627
Decrease in unamortized discounts		$ 226	$ 141	$ 185				$ 51	$ 103	$ 93	$ 249	$ 206	$ 228	$ 1,243	$ 1,066	$ 1,157			$ 631	$ 622	$ 627
Effective interest rate			9.58%		6.00%			7.41%				7.87%			10.63%			7.75%		8.05%