Property, Plant and Equipment

3 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

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

	March 31, 2017		December 31, 2016
Plant in service	$	1,124,446	$	1,085,318
Plant under construction	61,980		73,759
	1,186,426		1,159,077
Less accumulated amortization and depreciation	496,478		460,955
Net property, plant and equipment	$	689,948	$	698,122