PROPERTY, PLANT AND EQUIPMENT ("PP&E") (Tables)

12 Months Ended

Dec. 31, 2015

PROPERTY, PLANT AND EQUIPMENT ("PP&E")

Summary of Oil and Natural Gas Properties Cost and Accumulated Depletion

As at December 31, 2015 ($ thousands)		Cost		Accumulated Depletion, Depreciation, and Impairment		Net Book Value
Oil and natural gas properties	$	13,541,670	$	12,375,083	$	1,166,587
Other capital assets		105,124		85,438		19,686
Total PP&E	$	13,646,794	$	12,460,521	$	1,186,273

As at December 31, 2014 ($ thousands)		Cost		Accumulated Depletion, Depreciation, and Impairment		Net Book Value
Oil and natural gas properties	$	12,478,953	$	9,846,479	$	2,632,474
Other capital assets		97,893		77,302		20,591
Total PP&E	$	12,576,846	$	9,923,781	$	2,653,065