Quarterly report pursuant to Section 13 or 15(d)

Oil and Gas Activities (Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities) (Details)

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Oil and Gas Activities (Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 30, 2013
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved Oil and Gas Property, Successful Effort Method $ 35,872 $ 35,377
Less accumulated depletion, depreciation and amortization (6,216) (5,814)
Total net proved oil and gas properties 29,656 29,563
Unproved Oil and Gas Property, Successful Effort Method 5,238 5,312
Wells in progress 14,459 923
United States
    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved Oil and Gas Property, Successful Effort Method 28,039 27,606
Unproved Oil and Gas Property, Successful Effort Method 269 261
Wells in progress 13,503 235
Australia
    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved Oil and Gas Property, Successful Effort Method 7,833 7,771
Unproved Oil and Gas Property, Successful Effort Method 3,866 3,976
United Kingdom
    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Unproved Oil and Gas Property, Successful Effort Method 1,103 1,075
Wells in progress $ 956 $ 688