Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Pension Benefits [Member]
Components of net periodic cost:
Service cost	$ 19	$ 127
Interest cost	315	588
Expected return on plan assets	(101)	(99)
Recognized net actuarial loss (gain)	184	264
Amortization of prior service cost	21	185
Net periodic cost	438	1,065
Retiree Health Care Benefits [Member]
Components of net periodic cost:
Service cost	20	7
Interest cost	47	59
Recognized net actuarial loss (gain)	(13)	(18)
Amortization of prior service cost	27	35
Net periodic cost	$ 81	$ 83