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Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2013

Property, Plant and Equipment [Abstract]

Property, plant and equipment consisted of the following (in thousands):

	June 30, 2013		December 31, 2012
Plant in service	$	606,851	$	586,216
Plant under construction		18,380		25,469
		625,231		611,685
Less accumulated amortization and depreciation		238,650		246,211
Net property, plant and equipment	$	386,581	$	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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