Assets Held for Sale and Discontinued Operations (Details 2) (USD $)	3 Months Ended								12 Months Ended												12 Months Ended			12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 Acreage and exploratory wells	Dec. 31, 2012 Oil and Gas item	Dec. 31, 2011 Oil and Gas	Dec. 31, 2010 Oil and Gas item	Dec. 31, 2008 Oil and Gas item	Dec. 31, 2007 Oil and Gas item	Dec. 31, 2011 Oil and Gas Cat Canyon and West Cat Canyon	Dec. 31, 2011 Oil and Gas Colombia	Dec. 31, 2012 Oil and Gas Canada	Dec. 31, 2011 Oil and Gas Remora	Dec. 31, 2010 Oil and Gas Remora	Dec. 31, 2010 Oil and Gas SMVP	Dec. 31, 2012 Other Rig Services	Dec. 31, 2011 Other Rig Services	Dec. 31, 2010 Other Rig Services	Dec. 31, 2012 Other Rig Services Aircraft logistics assets	Dec. 31, 2011 Other Rig Services Aircraft logistics assets
Discontinued Operations, Disclosure
Ownership percentage																						49.70%	50.00%
Condensed Statements of Income
Operating revenues and Earnings (losses) from unconsolidated affiliates													$ 27,363,000	$ 125,654,000	$ 37,615,000									$ 25,813,000	$ 29,713,000	$ 29,739,000
Income (loss) from discontinued operations
Income (loss) from discontinued operations													(3,954,000)	18,660,000	(26,139,000)									(2,080,000)	(210,000)	1,059,000
Impairment charges or other gains and losses on sale of assets													(106,100,000)	(208,235,000)	(192,179,000)									(9,082,000)	(7,853,000)	(7,460,000)
Impairment of long-lived assets									(50,355,000)		(27,372,000)																(7,800,000)	(7,900,000)
Gain (loss) on sale of wholly owned assets												137,800,000							39,600,000
Less: income tax expense (benefit)													(44,021,000)	(98,181,000)	(62,028,000)									(2,795,000)	(2,017,000)	(1,601,000)
Income (loss) from discontinued operations, net of tax	(101,121,000)	10,826,000	24,690,000	(8,795,000)	(193,985,000)	(12,226,000)	121,167,000	(12,396,000)	(74,400,000)	(97,440,000)	(161,090,000)		(66,033,000)	(91,394,000)	(156,290,000)									(8,367,000)	(6,046,000)	(4,800,000)
Impairment of oil and gas properties financing receivable														27,200,000	54,300,000
Equity in earnings	1,200,000	(99,500,000)	(134,300,000)	(68,700,000)	(2,700,000)	33,700,000	9,300,000	16,300,000	(301,320,000)	56,647,000	33,267,000		(301,801,000)	59,685,000	18,657,000						83,000,000
Increase in wholly owned assets related to pipeline contractual commitments													128,100,000
Sale of business
Sale price																			89,200,000
Gain on sale of oil and gas operations												137,800,000							39,600,000
Impairment of logistics assets									50,355,000		27,372,000																7,800,000	7,900,000
Long-term deferred income taxes																				106,000,000
Approximate undiscounted contractual commitment													339,600,000
Total liabilities of discontinued operations													206,000,000	125,000,000
Current liabilities of discontinued operations	68,961,000				54,287,000				68,961,000	54,287,000			69,000,000	71,000,000
Sale price																			89,200,000
Cash distribution of proceeds from asset sales of subsidiaries									9,529,000				104,500,000								143,000,000
Receivables held for sale													4,100,000	13,700,000
Working interest sold (as a percent)																		25.00%
Proceed from sale of working interest																		71,600,000
Number of wells suspended									7				2		2	1	2
Capitalized costs of wells suspended													70,200,000
Earnings (losses) from unconsolidated affiliates	1,200,000	(99,500,000)	(134,300,000)	(68,700,000)	(2,700,000)	33,700,000	9,300,000	16,300,000	(301,320,000)	56,647,000	33,267,000		(301,801,000)	59,685,000	18,657,000						83,000,000
Impairment of oil and gas properties financing receivable														$ 27,200,000	$ 54,300,000