Quarterly report pursuant to Section 13 or 15(d)

Derivative Instrument and Hedging Transactions (Realized Gain (Loss)) (Details)

v3.7.0.1
Derivative Instrument and Hedging Transactions (Realized Gain (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Unrealized (losses) gains on open future commodity and forward contracts and open sale and purchase commitments, net $ 23,592 $ (5,262) $ (11,241) $ (8,482)
Realized gains (losses) on future commodity contracts, net (193) 7,992 15,631 (5,796)
Gains (losses) on derivative instruments: $ 23,399 $ 2,730 $ 4,390 $ (14,278)