Condensed Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenue
Production	$ 102,615		$ 104,546		$ 332,187		$ 358,281
Sales of purchased natural gas	16,660		15,130		53,401		50,373
Net derivative gains (losses)	43,310		32,733		(15,080)		36,202
Other	913		707		2,808		2,462
Total revenue	163,498		153,116		373,316		447,318
Operating expense
Lease operating	17,176		18,591		54,622		63,699
Gathering, processing and transportation	34,807		35,567		102,511		112,064
Production and ad valorem taxes	4,067		4,678		12,557		15,462
Costs of purchased natural gas	16,599		15,114		53,305		50,311
Depletion, depreciation and accretion	13,969		14,390		42,584		47,911
Impairment of Oil and Gas Properties	135		0		135		0
General and administrative	11,310		10,471		38,115		43,509
Other operating	651		2,230		2,221		4,435
Total expense	98,714		101,041		306,050		337,391
Operating income (loss)	64,784		60,049		67,266		451,073
Other income - net	(2,465)		667		(3,824)		(14,588)
Fortune Creek accretion	(3,602)		(4,818)		(11,605)		(14,490)
Interest expense	(39,899)		(39,355)		(121,927)		(210,535)
Income (loss) before income taxes	18,818		16,543		(70,090)		211,460
Income tax (expense) benefit	4,939		(5,966)		(1,081)		(18,063)
Net Income (Loss) Attributable to Parent	23,757		10,577		(71,171)		193,397
Reclassification adjustments related to settlements of derivative contracts into production revenue- net of income tax	(7,968)		(11,139)		(20,939)		(37,181)
Foreign currency translation adjustment	(6,921)		2,345		(6,162)		(933)
Other comprehensive income (loss)	(14,889)		(8,794)		(27,101)		(38,114)
Comprehensive income (loss)	8,868		1,783		(98,272)		155,283
Earnings (loss) per common share - basic	$ 0.13		$ 0.06		$ (0.41)		$ 1.10
Earnings (loss) per common share - diluted	$ 0.13	[1]	$ 0.06	[1]	$ (0.41)	[1]	$ 1.10	[1]
Tokyo Gas [Member]
Operating expense
Gain (Loss) on Disposition of Oil and Gas and Timber Property	$ 0		$ 7,974		$ 0		$ 341,146

[1] For the three months ended September 30, 2014, 6.6 million shares associated with our stock options and 1.2 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the three months ended September 30, 2013, 6.2 million shares associated with our stock options and 0.2 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the nine months ended September 30, 2014, 6.6 million shares associated with our stock options and 0.8 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the nine months ended September 30, 2013, 5.5 million shares associated with our stock options and 0.2 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations.