Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2015

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, 2015		December 31, 2014
Land	n/a	$	3,191	$	2,884
Gathering systems	3 to 47 years	5,431,716		4,972,892
Pipelines and equipment	15 to 45 years	136,303		151,107
Assets under construction	n/a	272,445		483,347
Other	3 to 40 years	19,066		16,420
Total property, plant and equipment		5,862,721		5,626,650
Accumulated depreciation		1,072,799		1,055,207
Net property, plant and equipment		$	4,789,922	$	4,571,443