SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Costs Incurred in Natural Gas and Crude Oil Property Acquisition, Exploration and Development Activities (Unadited) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Proved Properties	$ 28,698,000	[1]	$ 105,303,000	[1]	$ 79,554,000	[1]
Unproved Properties	3,390,000	[1]	276,225,000	[1]	95,081,000	[1]
Development Costs	332,250,000	[2]	233,144,000	[2]	301,008,000	[2]
Exploratory drilling	58,988,000	[3]	18,803,000	[3]	3,626,000	[3]
Geological and geophysical	752,000	[3]	1,925,000	[3]	1,846,000	[3]
Total Costs Incurred	424,078,000		635,400,000		481,115,000
Cost Incurred to Convert PUDs to PDNP	$ 40,100,000		$ 62,000,000		$ 80,600,000

[1] Property acquisition costs represent costs incurred to purchase, lease or otherwise acquire a property.

[2] Development costs represent costs incurred to gain access to and prepare development well locations for drilling, drill and equip development wells, recomplete wells and provide facilities to extract, treat, gather and store crude oil, natural gas and NGLs. Of these costs incurred for the years ended December 31, 2013, 2012 and 2011, $40.1 million, $62.0 million and $80.6 million, respectively, were incurred to convert proved undeveloped reserves to proved developed reserves from the prior year end.

[3] Exploration costs - represents costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing crude oil, natural gas and NGLs.