Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Information (Unaudited) - Discounted Future Net Cash Flows (Details)

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Supplemental Oil and Gas Information (Unaudited) - Discounted Future Net Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Discount Rate 10.00%    
Standardized measures of discounted future net cash flows $ 17,017 $ 87,043 $ 107,676
United States      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash inflows 131,979 493,901  
Future production costs (85,372) (226,464)  
Future development costs (7,021) (23,594)  
Future income tax expense 0 (73,820)  
Future net cash flows 39,586 170,023  
10% annual discount (22,569) (82,980)  
Standardized measures of discounted future net cash flows $ 17,017 $ 87,043 $ 97,391