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Pension And Other Postretirement Benefit Plans (Estimated Future Benefit Payments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Pension Benefits [Member]
 
2013 $ 26,356
2014 16,750
2015 14,878
2016 18,203
2017 19,183
2018 - 2022 100,682
Other Postretirement Benefits [Member]
 
2013 3,213
2014 3,274
2015 3,329
2016 3,353
2017 3,404
2018 - 2022 $ 16,424