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Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2013

Property, Plant and Equipment [Abstract]

Property, plant and equipment consisted of the following:

	March 31, 2013		December 31, 2012
Plant in service	$	592,900	$	586,216
Plant under construction		29,248		25,469
		622,148		611,685
Less accumulated amortization and depreciation		251,952		246,211
Net property, plant and equipment	$	370,196	$	365,474

- 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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