Derivative Instruments and Hedging Activities (Components of Gain (Loss) on Derivative Instruments) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended					5 Months Ended	6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 03, 2014	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2013	Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivative financial instruments				$ 21,857
Successor Company [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash settlements, net of purchased put premium	$ (1,551)	$ (19)	$ 23,091	$ 1,812				$ 24,903		$ 24,884		$ 24,417
Proceeds from monetizations			4,559					4,559		4,559		4,559
Unrealized change in fair value	(9,528)	(1,614)	(5,388)	$ 20,045				14,657		13,043		11,106
Total gain (loss) on derivative financial instruments	$ (11,079)	$ (2,213)	$ 22,262	21,857				$ 44,119		$ 41,906		$ 40,082
Predecessor Company [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash settlements, net of purchased put premium				$ (3,534)	$ 3,746	$ (3,623)	$ (26,416)		$ (7,156)		$ (3,409)		$ (11,477)	$ (3,814)
Proceeds from monetizations
Unrealized change in fair value				$ (26,478)	$ (16,888)	$ (21,705)	6,996		$ (48,184)		$ (65,073)		(20,884)	(9,491)
Total gain (loss) on derivative financial instruments							$ (19,420)						$ (32,361)	$ (13,305)