Property, Plant and Equipment

6 Months Ended

Jun. 30, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

2. Property, Plant and Equipment

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

	June 30, 2015		December 31, 2014
Plant in service	$	692,038	$	675,321
Plant under construction		22,550		18,078
		714,588		693,399
Less accumulated amortization and depreciation		311,711		287,492
Net property, plant and equipment	$	402,877	$	405,907