Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 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:

		December 31,
thousands	Estimated Useful Life	2016		2015
Land	n/a	$	4,012	$	3,744
Gathering systems and processing complexes	3 to 47 years	6,462,053		6,061,004
Pipelines and equipment	15 to 45 years	139,646		136,290
Assets under construction	n/a	226,626		329,887
Other	3 to 40 years	29,605		25,853
Total property, plant and equipment		6,861,942		6,556,778
Accumulated depreciation		1,812,010		1,697,999
Net property, plant and equipment		$	5,049,932	$	4,858,779