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Property, Plant and Equipment (Notes)
9 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
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


 
Depreciation expense attributed to property, plant and equipment was $22.2 million and $66.7 million for the three and nine months ended December 31, 2013, respectively, and $23.0 million and $66.0 million for the three and nine months ended December 31, 2012, respectively.