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Property, Plant and Equipment (Tables)
9 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (amounts in thousands):
 
December 31, 2013
 
March 31, 2013
Land
$
55,601

 
$
47,102

Building and building improvements
407,520

 
396,611

Machinery and equipment
1,442,169

 
1,377,814

Projects in process
62,217

 
76,158

 
1,967,507

 
1,897,685

Less accumulated depreciation and amortization
1,446,942

 
1,383,141

 
$
520,565

 
$
514,544