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Contingencies and Legacy Environmental Commitments (Tables)
 6 Months Ended
Sep. 30, 2013
Schedule of Environmental Activity

The environmental activity is summarized as follows:

 

Balance at March 31, 2013

$

  12,684

 

 

Environmental costs incurred

 

(602

)

 

Interest accretion

 

  174

 

 

Reduction of environmental reserve-Wyoming Illinois

 

(1,207

)

 

Balance at September 30, 2013

$

  11,049