CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Current assets:
Cash and cash equivalents	$ 1,056		$ 3,012		$ 217,569	$ 458,275
Accounts receivable	67,516		79,089
Other current assets	56,508		128,571
Total current assets	125,080		210,672
Property and equipment, at cost	10,038,332		9,601,102
Less accumulated depreciation, depletion, and amortization	8,284,094		6,949,986
Net property and equipment	1,754,238	[1]	2,651,116	[1]
Investment in subsidiaries	0		0
Goodwill	239,420		239,420
Due from subsidiaries	0		0
Deferred income taxes	14,681		231,116
Other assets	68,443		48,827
TOTAL ASSETS	2,201,862		3,381,151
Current liabilities:
Accounts payable and accrued liabilities	164,786		247,880
Other current liabilities	61,539		92,957
Total current liabilities	226,325		340,837
Long-term debt	1,862,088		1,693,044
Due to parent and subsidiaries	0		0
Deferred income taxes	0		0
Other liabilities	156,273		154,157
Total liabilities	2,244,686		2,188,038
Shareholders’ equity (deficit)	(42,824)		1,193,113		1,352,787	1,079,154
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	2,201,862		3,381,151
Parent Company
Current assets:
Cash and cash equivalents	667		1,734
Accounts receivable	33,979		43,999
Other current assets	55,869		127,667
Total current assets	90,515		173,400
Property and equipment, at cost	8,439,898		8,000,466
Less accumulated depreciation, depletion, and amortization	6,937,606		5,782,409
Net property and equipment	1,502,292		2,218,057
Investment in subsidiaries	68,048		160,591
Goodwill	216,460		216,460
Due from subsidiaries	116,602		214,394
Deferred income taxes	111,015		312,564
Other assets	68,443		48,827
TOTAL ASSETS	2,173,375		3,344,293
Current liabilities:
Accounts payable and accrued liabilities	157,404		235,788
Other current liabilities	55,187		86,618
Total current liabilities	212,591		322,406
Long-term debt	1,862,088		1,693,044
Due to parent and subsidiaries	0		0
Deferred income taxes	0		0
Other liabilities	141,520		135,730
Total liabilities	2,216,199		2,151,180
Shareholders’ equity (deficit)	(42,824)		1,193,113
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	2,173,375		3,344,293
Guarantor Subsidiary
Current assets:
Cash and cash equivalents	45		1		3	379
Accounts receivable	27,969		34,142
Other current assets	286		313
Total current assets	28,300		34,456
Property and equipment, at cost	1,416,364		1,317,917
Less accumulated depreciation, depletion, and amortization	1,173,332		1,102,339
Net property and equipment	243,032		215,578
Investment in subsidiaries	0		0
Goodwill	22,960		22,960
Due from subsidiaries	83,983		46,944
Deferred income taxes	0		0
Other assets	0		0
TOTAL ASSETS	378,275		319,938
Current liabilities:
Accounts payable and accrued liabilities	2,133		8,846
Other current liabilities	67		63
Total current liabilities	2,200		8,909
Long-term debt	0		0
Due to parent and subsidiaries	0		0
Deferred income taxes	132,440		107,012
Other liabilities	3,642		2,614
Total liabilities	138,282		118,535
Shareholders’ equity (deficit)	239,993		201,403
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	378,275		319,938
Combined Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	344		1,277		986	918
Accounts receivable	6,393		2,201
Other current assets	353		591
Total current assets	7,090		4,069
Property and equipment, at cost	182,070		282,719
Less accumulated depreciation, depletion, and amortization	173,156		65,238
Net property and equipment	8,914		217,481
Investment in subsidiaries	0		0
Goodwill	0		0
Due from subsidiaries	0		0
Deferred income taxes	36,106		25,564
Other assets	0		0
TOTAL ASSETS	52,110		247,114
Current liabilities:
Accounts payable and accrued liabilities	6,074		4,499
Other current liabilities	6,285		6,276
Total current liabilities	12,359		10,775
Long-term debt	0		0
Due to parent and subsidiaries	200,585		261,338
Deferred income taxes	0		0
Other liabilities	11,111		15,813
Total liabilities	224,055		287,926
Shareholders’ equity (deficit)	(171,945)		(40,812)
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	52,110		247,114
Eliminations
Current assets:
Cash and cash equivalents	0		0
Accounts receivable	(825)		(1,253)
Other current assets	0		0
Total current assets	(825)		(1,253)
Property and equipment, at cost	0		0
Less accumulated depreciation, depletion, and amortization	0		0
Net property and equipment	0		0
Investment in subsidiaries	(68,048)		(160,591)
Goodwill	0		0
Due from subsidiaries	(200,585)		(261,338)
Deferred income taxes	(132,440)		(107,012)
Other assets	0		0
TOTAL ASSETS	(401,898)		(530,194)
Current liabilities:
Accounts payable and accrued liabilities	(825)		(1,253)
Other current liabilities	0		0
Total current liabilities	(825)		(1,253)
Long-term debt	0		0
Due to parent and subsidiaries	(200,585)		(261,338)
Deferred income taxes	(132,440)		(107,012)
Other liabilities	0		0
Total liabilities	(333,850)		(369,603)
Shareholders’ equity (deficit)	(68,048)		(160,591)
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ (401,898)		$ (530,194)

[1] At December 31, 2011, $98.7 million of the Company’s total net property and equipment was located in foreign countries. This balance was written off during 2012 when the South African properties were impaired and the Italian natural gas reserves were reclassified from proved to probable, causing a full ceiling test write-down of the Italian cost center, both of which are discussed in Note 1.