Assets Held-for-Sale and Discontinued Operations (Details 2) (USD $)	3 Months Ended								12 Months Ended			1 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2013	Apr. 30, 2013
Discontinued operations
Undiscounted contractual commitments	$ 84,600,000				$ 171,200,000				$ 84,600,000	$ 171,200,000
Liability related to discontinued operation	40,200,000				113,600,000				40,200,000	113,600,000
Current liability to discontinued operations	19,602,000				64,404,000				19,602,000	64,404,000
Income (loss) from discontinued operations
Income (loss) from discontinued Operations, net of tax	(4,467,000)	4,005,000	(1,032,000)	1,515,000	23,113,000	(14,430,000)	(26,873,000)	7,011,000	21,000	(11,179,000)	(67,526,000)
U.S. oil and gas joint venture earnings (losses)	(400,000)	(2,900,000)	(600,000)	(2,400,000)	(1,600,000)	(2,600,000)	1,400,000	2,900,000	(6,301,000)	39,000	(288,718,000)
Long-term deferred income taxes	443,003,000				516,161,000				443,003,000	516,161,000
Impairment of long-lived assets									217,627,000	20,000,000	50,355,000
Cash proceeds from sale of businesses in Alaska									35,100,000
Receivables held for sale	27,000,000								27,000,000
Proceed from sale of working interest									600,000,000
Sale of business
Gain on sale of oil and gas operations									22,200,000
Other long-term assets	303,958,000				227,708,000				303,958,000	227,708,000
Oil and Gas
Operating revenues
Operating revenues									13,143,000	25,327,000	27,363,000
Income (loss) from discontinued operations
Income (loss) from discontinued operations									(1,840,000)	(17,371,000)	(3,958,000)
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets									(1,313,000)	24,087,000	106,096,000
Less: Income tax expense (benefit)									(548,000)	(14,062,000)	(44,021,000)
Income (loss) from discontinued Operations, net of tax									21,000	(27,396,000)	(66,033,000)
U.S. oil and gas joint venture earnings (losses)											(289,199,000)
Write own of carrying value of assets offset by gain of future pipeline obligations										61,500,000
Increase in pipeline contractual commitments											128,100,000
Gross cash proceeds										90,000,000
Sale of business
Other long-term assets	26,200,000								26,200,000
Oil and Gas | Sabine Oil Gas LLC
Income (loss) from discontinued operations
Gross cash proceeds											254,500,000
Ownership percentage											49.70%
Oil and Gas | CANADA
Income (loss) from discontinued operations
Long-term deferred income taxes	2,300,000								2,300,000
Rig Services
Operating revenues
Operating revenues										127,154,000	172,335,000
Income (loss) from discontinued operations
Income (loss) from discontinued operations										17,680,000	9,846,000
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets										(4,368,000)	9,087,000
Less: Income tax expense (benefit)										5,831,000	2,252,000
Income (loss) from discontinued Operations, net of tax										16,217,000	(1,493,000)
Sale price													9,300,000
Rig Services | Aircraft Logistics
Income (loss) from discontinued operations
Impairment of long-lived assets											7,800,000
Rig Services | Peak
Income (loss) from discontinued operations
Cash proceeds from sale of businesses in Alaska												$ 135,500,000