Related Party Transactions Related Party Transactions - Due to/Due from Affiliates (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2012 Juneau Exploration LLC [Member]	Sep. 30, 2011 Juneau Exploration LLC [Member]	Sep. 30, 2012 REX [Member]	Sep. 30, 2011 REX [Member]
Related Party Transaction [Line Items]
Trade receivable	$ 28,332	$ 29,688	$ 6	$ 20	$ 1	$ 18
Joint interest billing	4,695	4,768	151	158	142	92
Royalties and revenue payable	18,709	22,098	(722)	(813)	(515)	(682)
Joint Interest Billings Payable			$ (257)

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a(1)

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant