Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 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	March 31,   2019		December 31,   2018
Land	n/a	$	8,858	$	5,298
Gathering systems – pipelines	30 years	4,828,320		4,764,099
Gathering systems – compressors	15 years	1,809,009		1,712,939
Processing complexes and treating facilities	25 years	2,944,387		2,844,337
Transportation pipeline and equipment	6 to 45 years	172,637		172,558
Produced water disposal systems	20 years	667,106		629,946
Assets under construction	n/a	603,234		604,265
Other	3 to 40 years	546,778		525,331
Total property, plant and equipment		11,580,329		11,258,773
Less accumulated depreciation		2,950,330		2,848,420
Net property, plant and equipment		$	8,629,999	$	8,410,353