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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Summary of property, plant and equipment

	Useful	December 31,
(Thousands of dollars)	Lives	2011			2010
Land and improvements	0-15 years	$	173,517		$	166,201
Buildings and improvements	30 years	376,659			348,160
Machinery and equipment	3-20 years	794,435			727,148
Vessels and vehicles	3-18 years	147,125			144,380
Office furniture and fixtures	5 years	28,376			26,527
Construction in progress		136,396			83,896
		1,656,508			1,496,312
Accumulated depreciation and amortization		(859,686		)	(795,181		)
Net property, plant and equipment		$	796,822		$	701,131

- 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.

+ References+ Details