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Property, Plant and Equipment (Tables)
3 Months Ended
Jun. 30, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (amounts in thousands):
 
June 30, 2012
 
March 31, 2012
Land
$
46,529

 
$
46,529

Building and building improvements
374,371

 
374,042

Machinery and equipment
1,330,736

 
1,314,303

Projects in process
74,980

 
83,676

 
1,826,616

 
1,818,550

Less accumulated depreciation and amortization
1,320,387

 
1,301,939

 
$
506,229

 
$
516,611