Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets and Liabilities Measured on a Nonrecurring Basis (Details)

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Fair Value Measurements - Assets and Liabilities Measured on a Nonrecurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of proved oil and gas properties       $ 17,400
Exploration impairment cost     $ 0 $ 20
One Stone Exchange Agreement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset impairment charges $ 11,300   $ 11,300  
Impairment of proved oil and gas properties 7,800 $ 7,800    
Accounts receivable impairment charges   100    
Exploration impairment cost $ 3,400 $ 3,400