Net Property and Equipment

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment, Net [Abstract]

Net Property and Equipment

Net Property and Equipment

Net property and equipment includes the following at December 31, 2015 and 2014:

	December 31,
In thousands	2015			2014
Proved crude oil and natural gas properties	$	19,520,724		$	17,045,967
Unproved crude oil and natural gas properties	682,988			966,080
Service properties, equipment and other	307,059			274,584
Total property and equipment	20,510,771			18,286,631
Accumulated depreciation, depletion and amortization	(6,447,443		)	(4,650,779		)
Net property and equipment	$	14,063,328		$	13,635,852