Related Party Transactions - Payments Recieved from (paid to) JEX and REX during Ordinary Course of Business (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Juneau Exploration LLC [Member]
Related Party Transaction [Line Items]
Revenue payments for ownership in wells	$ (1,133)	$ (1,283)
Joint interest billing receipts	220	247
REX [Member]
Related Party Transaction [Line Items]
Revenue payments for ownership in wells	(849)	(30)
Joint interest billing receipts	$ 91	$ 1,082