Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Table

A summary of the historical cost of property, plant and equipment is as follows:

thousands	Estimated Useful Life	September 30, 2016		December 31, 2015
Land	n/a	$	4,000	$	3,744
Gathering systems	3 to 47 years	6,471,338		6,061,004
Pipelines and equipment	15 to 45 years	135,504		136,290
Assets under construction	n/a	272,169		329,887
Other	3 to 40 years	29,895		25,853
Total property, plant and equipment		6,912,906		6,556,778
Accumulated depreciation		1,882,012		1,697,999
Net property, plant and equipment		$	5,030,894	$	4,858,779