Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2014

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

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

	June 30, 2014		December 31, 2013
Plant in service	$	666,830	$	633,480
Plant under construction		16,118		23,181
		682,948		656,661
Less accumulated amortization and depreciation		277,138		247,698
Net property, plant and equipment	$	405,810	$	408,963