Assets Held-for-Sale and Discontinued Operations (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Discontinued operations
Undiscounted contractual commitments	$ 95,200,000		$ 95,200,000
Liability related to discontinued operation	47,100,000		47,100,000		113,600,000
Current liability to discontinued operations	23,817,000		23,817,000		64,404,000
Income (loss) from discontinued operations
Income (loss) from discontinued operations, net of tax	4,005,000	(14,430,000)	4,488,000	(34,292,000)
Impairment of long-lived assets		20,000,000		20,000,000
Gain on sale of oil and gas operations	22,200,000
Other long-term assets	235,139,000		235,139,000		227,708,000
Oil and Gas
Operating revenues
Operating revenues	2,314,000	1,803,000	10,842,000	23,842,000
Income (loss) from discontinued operations
Income (loss) from discontinued operations	(509,000)	(8,555,000)	1,027,000	(11,227,000)
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets and obligations	(7,312,000)	4,834,000	(5,901,000)	47,027,000
Less: Income tax expense (benefit)	2,798,000	2,011,000	2,440,000	(9,154,000)
Income (loss) from discontinued operations, net of tax	4,005,000	(15,400,000)	4,488,000	(49,100,000)
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
Gain on sale of oil and gas operations	22,200,000		22,200,000
Other long-term assets	26,200,000		26,200,000
Rig Services
Operating revenues
Operating revenues		34,800,000		116,500,000
Income (loss) from discontinued operations
Income (loss) from discontinued operations, net of tax		$ 1,000,000		$ 14,800,000