Supplemental Condensed Consolidating Financial Information (Supplemental Condensed Consolidating Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Oil sales	$ 73,372	$ 158,316
Natural gas sales	12,618	13,954
Gain on derivative financial instruments	2,778	21,857
Total Revenues	88,768	194,127
Lease operating	26,153	56,300
Transportation	723	625
Impairment of oil and natural gas properties	308,078
Goodwill impairment		329,293
Depreciation, depletion and amortization	57,660	73,745
Accretion of asset retirement obligations	6,741	6,181
Related party cost included in general and administrative expenses	7,944	8,042
Taxes, other than on earnings	(935)	2,528
Other		21
Total costs and expenses	406,364	476,735
Income from operations	(317,596)	(282,608)
Interest income	12
Interest expense	(16,984)	(10,901)
Total other expense	(16,972)	(10,901)
Loss before income taxes	(334,568)	(293,509)
Income tax expense (benefit)		12,847
Net loss	(334,568)	(306,356)
Parent Company [Member]
Oil sales	73,372	140,715
Natural gas sales	12,618	13,857
Gain on derivative financial instruments	2,778	21,857
Total Revenues	88,768	176,429
Lease operating	26,153	52,574
Transportation	723	624
Impairment of oil and natural gas properties	308,078
Goodwill impairment		329,293
Depreciation, depletion and amortization	57,660	68,005
Accretion of asset retirement obligations	6,741	5,343
Related party cost included in general and administrative expenses	7,944	8,042
Taxes, other than on earnings	(935)	105
Other		21
Total costs and expenses	406,364	464,007
Income from operations	(317,596)	(287,578)
Interest income	12
Interest expense	(16,984)	(10,901)
Income (loss) from equity investments		3,134
Total other expense	(16,972)	(7,767)
Loss before income taxes	(334,568)	(295,345)
Income tax expense (benefit)		11,011
Net loss	$ (334,568)	(306,356)
Guarantor Subsidiaries [Member]
Oil sales		17,601
Natural gas sales		97
Total Revenues		17,698
Lease operating		3,726
Transportation		1
Depreciation, depletion and amortization		5,740
Accretion of asset retirement obligations		838
Taxes, other than on earnings		2,423
Total costs and expenses		12,728
Income from operations		4,970
Loss before income taxes		4,970
Income tax expense (benefit)		1,836
Net loss		3,134
Consolidation, Eliminations [Member]
Income (loss) from equity investments		(3,134)
Total other expense		(3,134)
Loss before income taxes		(3,134)
Net loss		$ (3,134)