Property and equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Schedule of property and equipment

Other fixed assets consisted of the following components as of the dates presented:

(in thousands)	December 31, 2019			December 31, 2018
Computer hardware and software	$	9,881		$	9,222
Vehicles	9,407			10,660
Leasehold improvements	7,619			7,608
Buildings	7,055			7,804
Aircraft	—			6,402
Other	3,932			3,735
Depreciable total	37,894			45,431
Less accumulated depreciation and amortization	(23,649		)	(23,871		)
Depreciable total, net	14,245			21,560
Land	18,259			18,259
Total other fixed assets, net	$	32,504		$	39,819

The following table presents depreciation and amortization of other fixed assets for the periods presented:

	Years ended December 31,
(in thousands)	2019		2018		2017
Depreciation and amortization of other fixed assets	$	4,683	$	6,075	$	5,858

The following table presents depletion and depletion per BOE sold of evaluated oil and natural gas properties for the periods presented:

	Years ended December 31,
(in thousands except per BOE data)	2019		2018		2017
Depletion of evaluated oil and natural gas properties	$	250,857	$	196,458	$	143,592
Depletion expense per BOE sold	$	8.50	$	7.90	$	6.75

Midstream service assets consisted of the following components as of the dates presented:

(in thousands)	December 31, 2019			December 31, 2018
Midstream service assets	$	180,932		$	172,308
Less accumulated depreciation and impairment	(52,254		)	(42,063		)
Total midstream service assets, net	$	128,678		$	130,245

The following table presents depreciation of midstream service assets for the periods presented:

	Years ended December 31,
(in thousands)	2019		2018		2017
Depreciation of midstream service assets	$	10,206	$	10,144	$	8,939

Oil and natural gas properties consisted of the following components as of the dates presented:

(in thousands)	December 31, 2019			December 31, 2018
Evaluated properties	$	7,421,799		$	6,752,631
Unevaluated properties not being depleted	142,354			130,957
Less accumulated depletion and impairment	(5,725,114		)	(4,854,017		)
Total oil and natural gas properties, net	$	1,839,039		$	2,029,571

The following table presents full cost ceiling impairment expense, which is included in "Impairment expense" on the consolidated statements of operations for the periods presented:

	Years ended December 31,
(in thousands)	2019		2018		2017
Full cost ceiling impairment expense	$	620,565	$	—	$	—

Schedule of employee-related costs capitalized to oil and natural gas properties

The following table presents capitalized employee-related costs incurred in the acquisition, exploration and development of oil and natural gas properties for the periods presented:

	Years ended December 31,
(in thousands)	2019		2018		2017
Capitalized employee-related costs	$	18,299	$	25,372	$	25,553

Schedule of Benchmark Prices and Realized Prices used in the full cost ceiling calculation

The following table presents the Benchmark Prices and Realized Prices as of the dates presented:

	December 31, 2019		December 31, 2018		December 31, 2017
Benchmark Prices:
Oil ($/Bbl)	$	52.19	$	62.04	$	47.79
NGL ($/Bbl)(1)	$	21.14	$	31.46	$	26.13
Natural gas ($/MMBtu)	$	0.87	$	1.76	$	2.63
Realized Prices:
Oil ($/Bbl)	$	52.12	$	59.29	$	46.34
NGL ($/Bbl)	$	12.21	$	21.42	$	18.45
Natural gas ($/Mcf)	$	0.53	$	1.38	$	2.06

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(1)

Based on the Company's average composite NGL barrel.