XML 30 R28.htm IDEA: XBRL DOCUMENT

Asset Retirement Obligations (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Reconciliation of the total liability for asset retirement obligations [Roll Forward]
Beginning asset retirement obligation	$ 686	$ 510
Accretion of discount	28	34
Liabilities incurred	61	142
Ending asset retirement obligation	775	686
Mineral properties [Member]
Reconciliation of the total liability for asset retirement obligations [Roll Forward]
Ending asset retirement obligation	171	162
Oil & Gas wells [Member]
Reconciliation of the total liability for asset retirement obligations [Roll Forward]
Ending asset retirement obligation	$ 604	$ 524

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References+ Details

- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References+ Details