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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Pension Benefits
    
Periodic costs for employee retirement benefit plans    
Service Cost $ 549 $ 446
Interest Cost 604 467
Expected Return on Assets (614) (315)
Amortization of Unrecognized Losses 388 442
Amortization of Unrecognized Prior Service Cost 3   
Amortization of Transition Obligation    34
Net Periodic Benefit Cost 930 1,074
Other Benefits
    
Periodic costs for employee retirement benefit plans    
Service Cost 393 327
Interest Cost 565 401
Expected Return on Assets (570) (257)
Amortization of Unrecognized Losses 142 220
Amortization of Unrecognized Prior Service Cost 3   
Amortization of Transition Obligation    34
Net Periodic Benefit Cost $ 533 $ 725