6. PROPERTY, PLANT AND EQUIPMENT

A summary of property, plant and equipment at December 31 is as follows:

		2001		2000
Land and land improvements	$	51,818	$	43,144
Buildings and building equipment	311,499		222,860
Machinery and equipment	560,244		401,076
Software	38,438		30,430
Construction in progress	56,769		74,453
Total property, plant and equipment		1,018,768	771,963
Less accumulated depreciation	343,491		282,874
Total property, plant and equipment, net	$	675,277	$	489,089

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