Assets Held-for-Sale and Discontinued Operations (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income (loss) from discontinued operations
Income (loss) from discontinued operations, net of tax	$ (14,430,000)	$ 12,155,000	$ (34,292,000)	$ 35,888,000
Undiscounted contractual commitments	279,900,000		279,900,000
Liability related to discontinue operation	170,500,000		170,500,000		206,000,000
Current liability to discontinued operations	64,278,000		64,278,000		68,961,000
Oil and gas
Operating revenues
Operating revenues	2,577,000	12,859,000	24,616,000	19,079,000
Income (loss) from discontinued operations
Income (loss) from discontinued operations	(8,555,000)	5,527,000	(11,227,000)	(2,752,000)
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets	4,834,000	(3,961,000)	47,027,000	(40,429,000)
Less: Income tax expense (benefit)	2,011,000	(1,604,000)	(9,154,000)	2,623,000
Income (loss) from discontinued operations, net of tax	(15,400,000)	11,092,000	(49,100,000)	35,054,000
Rig Services
Operating revenues
Operating revenues	34,776,000	44,846,000	116,534,000	140,210,000
Income (loss) from discontinued operations
Income (loss) from discontinued operations	1,394,000	4,409,000	19,011,000	12,509,000
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets	67,000	2,459,000	(922,000)	7,728,000
Less: Income tax expense (benefit)	357,000	887,000	5,125,000	3,947,000
Income (loss) from discontinued operations, net of tax	$ 970,000	$ 1,063,000	$ 14,808,000	$ 834,000