Derivative Financial Instruments - Schedule of Offsetting Derivative Asset and Liability Positions (Details) - Counterparty A - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 291	$ 6,336
Derivative Asset, Fair Value, Gross Liability	(291)	(321)
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	0	6,015
Derivative Liability, Fair Value, Gross Liability	4,292	321
Derivative Liability, Fair Value, Gross Asset	(291)	(321)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	1,001	0
Derivative Liability	$ 3,000	$ 0