Properties, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2017

Table Text Blocks

Schedule of oil and gas properties

	September 30,		December 31,
(in thousands of dollars)	2017		2016
Mineral interests in properties
Unproved	$	190,722	$	213,153
Proved		882,386		1,054,683
Wells and equipment and related facilities		1,375,932		1,395,291
		2,449,040		2,663,127
Less: Accumulated depletion and impairment		(870,301)		(919,539)
Net oil and gas properties	$	1,578,739	$	1,743,588

Schedule of other property, plant and equipment

	September 30,		December 31,
(in thousands of dollars)	2017		2016
Leasehold improvements	$	1,186	$	1,213
Furniture, fixtures, computers and software		4,391		4,170
Vehicles		1,768		1,677
Aircraft		910		910
Other		211		284
		8,466		8,254
Less: Accumulated depreciation and amortization		(5,901)		(5,258)
Net other property, plant and equipment	$	2,565	$	2,996