The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Property, Plant, and Equipment (Details) (USD $)	3 Months Ended
Property, Plant, and Equipment (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Property, Plant, and Equipment
Gross property, plant and equipment	$ 552,684,000		$ 543,140,000
Less: Accumulated depreciation	137,305,000		131,540,000
Total net, property, plant, and equipment	415,379,000		411,600,000
Capitalized interest	400,000	600,000
Land and improvements
Property, Plant, and Equipment
Gross property, plant and equipment	3,787,000		2,611,000
Buildings and improvements
Property, Plant, and Equipment
Gross property, plant and equipment	1,611,000		1,223,000
Machinery and equipment
Property, Plant, and Equipment
Gross property, plant and equipment	527,691,000		403,682,000
Automotive equipment
Property, Plant, and Equipment
Gross property, plant and equipment	356,000		357,000
Furniture and fixtures
Property, Plant, and Equipment
Gross property, plant and equipment	346,000		343,000
Railcars
Property, Plant, and Equipment
Gross property, plant and equipment	2,496,000		2,496,000
Construction in progress
Property, Plant, and Equipment
Gross property, plant and equipment	$ 16,397,000		$ 132,428,000