Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 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:

thousands	Estimated Useful Life	September 30,   2018		December 31,   2017
Land	n/a	$	4,653	$	4,450
Gathering systems and processing complexes	3 to 47 years	7,883,265		7,113,114
Pipelines and equipment	15 to 45 years	137,769		137,644
Assets under construction	n/a	856,092		579,501
Other	3 to 40 years	30,976		29,826
Total property, plant and equipment		8,912,755		7,864,535
Less accumulated depreciation		2,494,121		2,133,644
Net property, plant and equipment		$	6,418,634	$	5,730,891