ASSETS HELD FOR SALE, DIVESTITURES AND DISCONTINUED OPERATIONS Discontinued Operations and Disposal Groups (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Asset retirement obligation	$ 2,061	[1]				$ 0	[1]				$ 2,061	[1]	$ 0	[1]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Impairment of Natural Gas and Crude Oil Properties											3		162,254		22,858
Income (loss) from discontinued operations, net of tax	0		(782)	3,416	1,537	(106,549)		(4,632)	(6,907)	9,071	4,171		(109,017)		(9,127)
Net Assets Held for Sale
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Properties and equipment	2,785										2,785
Asset retirement obligation	(2,061)										(2,061)
Net assets	724										724
Net Assets Related to Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Natural gas, NGL and crude oil sales											20,398		36,422		80,860
Sales from natural gas marketing											2,825		1,708		2,949
Well operations, pipeline income and other											890		1,888		2,542
Disposal Group, Discontinued Operations, Total revenue											24,113		40,018		86,351
Production Costs											7,975		22,453		30,885
Cost of natural gas marketing											2,673		1,529		2,634
Impairment of Natural Gas and Crude Oil Properties											3		162,254		22,858
Depreciation, depletion and amortization											2,258		48,101		47,521
Accretion of ARO and other, Discontinued Operations											2,528		2,084		1,054
(Gain) loss on sale of properties and equipment											2,330		(19,920)		(3,854)
Total costs, expenses and other											17,767		216,501		101,098
Income (loss) from discontinued operations											6,346		(176,483)		(14,747)
Income taxes (expense) benefit											(2,175)		67,466		5,620
Income (loss) from discontinued operations, net of tax											$ 4,171		$ (109,017)		$ (9,127)

[1] Represents asset retirement obligations related to assets sold and assets held for sale. See Note 14, Assets Held for Sale, Divestitures and Discontinued Operations, for additional information.