Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details 2)

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Employee Benefit Plans (Details 2) (Pension plans, defined benefit [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Pension plans, defined benefit [Member]
     
Changes in the Company's benefit obligation, plan assets and funded status for the pension plan      
Projected benefit obligation at beginning of year $ 30,430 $ 25,688  
Service cost 439 354  
Interest cost 1,427 1,421 1,340
Actuarial loss 1,561 3,889  
Benefit payments (1,579) (922)  
Projected benefit obligation at end of year $ 32,278 $ 30,430 $ 25,688