Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 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	June 30, 2015		December 31, 2014
Land	n/a	$	3,336	$	2,884
Gathering systems	3 to 47 years	5,527,042		4,972,892
Pipelines and equipment	15 to 45 years	136,303		151,107
Assets under construction	n/a	262,334		483,347
Other	3 to 40 years	19,133		16,420
Total property, plant and equipment		5,948,148		5,626,650
Accumulated depreciation		1,165,607		1,055,207
Net property, plant and equipment		$	4,782,541	$	4,571,443