Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Information (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows (Details)

v2.4.0.8
Supplemental Oil and Gas Information (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]    
Fiscal year beginning balance $ 107,676 $ 130,075
Net change in prices and production costs (10,222) (8,579)
Revisions of previous quantity estimates (34,441) (26,311)
Divestiture of reserves (10,285)  
Changes in estimated future development costs 3,161 3,478
Sales and transfers of oil and gas produced (4,720) (19,622)
Previously estimated development cost incurred during the period 1,723 3,426
Accretion of discount 14,632 20,285
Net change in income taxes 16,746 23,835
Net change in timing and other (1) 2,773 (18,911)
Fiscal year ending balance 87,043 107,676
United States
    
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]    
Fiscal year beginning balance 97,391 121,496
Net change in prices and production costs (10,222) (7,955)
Revisions of previous quantity estimates (34,441) (26,503)
Divestiture of reserves 0  
Changes in estimated future development costs 3,161 3,473
Sales and transfers of oil and gas produced (4,720) (20,178)
Previously estimated development cost incurred during the period 1,723 3,419
Accretion of discount 14,632 19,269
Net change in income taxes 16,746 22,258
Net change in timing and other (1) 2,773 (17,888)
Fiscal year ending balance 87,043 97,391
Australia
    
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]    
Fiscal year beginning balance 10,285 8,579
Net change in prices and production costs 0 (624)
Revisions of previous quantity estimates 0 192
Divestiture of reserves (10,285)  
Changes in estimated future development costs 0 5
Sales and transfers of oil and gas produced 0 556
Previously estimated development cost incurred during the period 0 7
Accretion of discount 0 1,016
Net change in income taxes 0 1,577
Net change in timing and other (1) 0 (1,023)
Fiscal year ending balance $ 0 $ 10,285