FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
loc_Customer No 1 [Member] | Sales Revenue, Services, Net [Member]
Concentrations of Credit Risk [Abstract]
Customer concentration, percentage of consolidated revenues	29.00%	29.00%	20.00%
Customer No 2 [Member] | Sales Revenue, Services, Net [Member]
Concentrations of Credit Risk [Abstract]
Customer concentration, percentage of consolidated revenues	11.00%	21.00%	15.00%
Customer No 3 [Member] | Sales Revenue, Services, Net [Member]
Concentrations of Credit Risk [Abstract]
Customer concentration, percentage of consolidated revenues		11.00%	11.00%
Customer No 4 [Member] | Sales Revenue, Services, Net [Member]
Concentrations of Credit Risk [Abstract]
Customer concentration, percentage of consolidated revenues			10.00%
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	2,230,646	1,265,699
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	2,009,598	1,134,358
5% Senior Notes, due 2017 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	445,568	420,019
5% Senior Notes, due 2017 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	398,678	398,394
7.875% Senior Notes Due 2019 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	617,076	588,495
7.875% Senior Notes Due 2019 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	497,842	497,511
4.875% Senior Notes Due 2022 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	761,509	0
4.875% Senior Notes Due 2022 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	714,775	0
5.400% Senior Notes, due 2042 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	406,493	0
5.400% Senior Notes, due 2042 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	398,303	0
Title XI Notes [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	0	257,185
Title XI Notes [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	0	238,453