Property Plant Equipment and Mineral Rights and Reserves

12 Months Ended

Dec. 31, 2011

Property Plant Equipment and Mineral Rights and Reserves [Abstract]

Property, Plant, Equipment and Mineral Rights and Reserves

(4)

Property, Plant, Equipment and Mineral Rights and Reserves

Property, plant, equipment and mineral rights and reserves consisted of the following:


	December 31,
	2011		2010
Mineral rights and reserves	$	41,861	$	51,435
Land		13,881		11,591
Buildings and improvements		95,388		86,410
Machinery and equipment		362,043		352,768
Construction in progress		24,907		15,173

		538,080		517,377

The range of useful lives to depreciate plant and equipment is as follows:



Buildings and improvements			3-50 years
Machinery and equipment			1-25 years

Depreciation and depletion were charged to income as follows:


	2011		2010		2009
Depreciation expense	$	34,969	$	30,039	$	28,872
Depletion expense		2,084		1,211		365

		37,053		31,250		29,237

- Definition

The entire disclosure for 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. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

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