Property, Plant and Equipment

6 Months Ended

Jun. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

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

	June 30, 2017		December 31, 2016
Plant in service	$	1,145,594	$	1,085,318
Plant under construction	68,707		73,759
	1,214,301		1,159,077
Less accumulated amortization and depreciation	534,838		460,955
Net property, plant and equipment	$	679,463	$	698,122