Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations (Summary results of the Company's discontinued operations) (Details)

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Discontinued Operations (Summary results of the Company's discontinued operations) (Details) - CO2 Business - Discontinued Operations, Held-for-sale - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenue $ 344 $ 688 $ 1,559 $ 3,543
Operating, exploration and general and administrative expenses 534 1,926 2,533 5,085
Depletion, depreciation, amortization and accretion 203 209 607 651
Impairment expense 11,280 0 11,280 0
Interest expense and other disposal costs 797 67 893 115
Total expenses 12,814 2,202 15,313 5,851
Non-controlling interest (12) (165) (36) (336)
Loss from discontinued operations before tax $ (12,458) $ (1,349) $ (13,718) $ (1,972)