Net Periodic Benefit Cost (Tables)

6 Months Ended

Sep. 30, 2012

Pension Plans, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

		Three months ended				Six Months Ended
		September 30,				September 30,
		2012		2011		2012		2011
Service costs	$	613	$	845	$	1,226	$	1,691
Interest cost		2,469		2,507		4,938		5,014
Expected return on plan assets		(2,803)		(2,688)		(5,606)		(5,376)
Net amortization		1,497		1,004		2,995		2,008
Curtailment (see below)		-		-		-		1,172
Net periodic pension cost	$	1,776	$	1,668	$	3,553	$	4,509

Other Postretirement Benefit Plans, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

		Three months ended				Six Months Ended
		September 30,				September 30,
		2012		2011		2012		2011
Interest cost		78		120		156		239
Amortization of plan net losses		36		82		72		164
Net periodic postretirement cost	$	114	$	202	$	228	$	403