Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

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

	September 30, 2015		December 31, 2014
Plant in service	$	700,828	$	675,321
Plant under construction		27,735		18,078
		728,563		693,399
Less accumulated amortization and depreciation		330,128		287,492
Net property, plant and equipment	$	398,435	$	405,907