Retirement Plan (Net Periodic Pension Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax		$ 28,986		$ 28,986
Other Comprehensive Income Pension Plan Termination		30,893	0	30,893	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	8,600	30,900	7,102		7,102
Defined Benefit Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefit earned during the period		0	509	0	679
Interest cost on projected benefit obligations		898	1,061	1,797	2,052
Expected return on plan assets		(46)	(949)	(92)	(1,899)
Amortization of prior service cost		0	50	0	67
Amortization of net loss		693	620	1,386	1,103
Estimated effect of curtailment		0	674	0	899
Net periodic pension expense		32,438	1,965	33,984	2,901
Other Post-Retirement Healthcare and Other Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefit earned during the period		278	475	556	950
Interest cost on projected benefit obligations		159	875	318	1,750
Amortization of prior service cost		(1,474)	(550)	(2,948)	(1,100)
Amortization of net loss		31	75	62	150
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax		0	0	1,726
Net periodic pension expense		$ (1,006)	$ 875	$ (286)	$ 1,750