Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment

Property, plant and equipment on the Consolidated Balance Sheets is summarized as follows:



	December 31,
(Thousands)	2012			2011
Land	$	8,797		$	9,123
Buildings	127,691			114,090
Machinery and equipment	570,001			485,593
Software	31,640			29,277
Construction in progress	15,389			86,149
Allowances for depreciation	(503,560		)	(476,443		)
Subtotal	249,956			247,789
Capital leases	10,912			10,898
Allowances for amortization	(1,440		)	(837		)
Subtotal	9,472			10,061
Mineral resources	4,979			5,029
Mine development	10,377			12,567
Allowances for amortization and depletion	(2,243		)	(12,048		)
Subtotal	13,113			5,548
Property, plant and equipment — net	$	272,542		$	263,398

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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