Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2019

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	June 30,   2019		December 31,   2018
Land	n/a	$	8,863	$	5,298
Gathering systems – pipelines	30 years	4,938,224		4,764,099
Gathering systems – compressors	15 years	1,839,353		1,712,939
Processing complexes and treating facilities	25 years	2,952,268		2,844,337
Transportation pipeline and equipment	6 to 45 years	172,807		172,558
Produced water disposal systems	20 years	697,949		629,946
Assets under construction	n/a	660,397		604,265
Other	3 to 40 years	582,297		525,331
Total property, plant and equipment		11,852,158		11,258,773
Less accumulated depreciation		3,058,512		2,848,420
Net property, plant and equipment		$	8,793,646	$	8,410,353