Property, Plant & Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant & Equipment [Abstract]

Summary of property, plant and equipment balances

The following is a summary of the Company's P. P. & E. balances at December 31:

(Thousands of dollars)	2012			2011

Land	$	29,026		$	27,883
Land improvements		13,142			10,379
Buildings		158,984			137,923
Machinery and equipment		310,944			306,151
Furniture and fixtures		9,647			8,779
Computer equipment and software		37,708			16,359
Construction in progress		125,545			106,789
Total property, plant and equipment		684,996			614,263
Less accumulated depreciation		(283,323	)		(267,833	)
Total property, plant and equipment, net	$	401,673		$	346,430

- 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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