Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

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	2018		2017
Land	n/a	$	5,298	$	5,096
Gathering systems and processing complexes	3 to 49 years	10,441,574		7,851,458
Pipelines and equipment	6 to 45 years	172,497		137,644
Assets under construction	n/a	604,265		954,719
Other	3 to 40 years	35,139		30,701
Total property, plant and equipment		11,258,773		8,979,618
Less accumulated depreciation		2,848,420		2,213,718
Net property, plant and equipment		$	8,410,353	$	6,765,900