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Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2014

Property, Plant and Equipment [Abstract]

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

	March 31,		December 31,
	2014		2013
Plant in service	$	654,586	$	633,480
Plant under construction		13,136		23,181
		667,722		656,661
Less accumulated amortization and depreciation		261,993		247,698
Net property, plant and equipment	$	405,729	$	408,963

- 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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