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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

The historical costs of our property and equipment and related accumulated depreciation balances were as follows at the dates indicated (in thousands):


	Estimated
	Useful Life	December 31,
	in Years	2019		2018

Tractors and trailers ⁽¹⁾	5 – 6	$	115,693	$	96,523
Field equipment ⁽²⁾	2 – 5	25,094		20,725
Buildings	5 – 39	16,055		15,746
Office equipment	2 – 5	1,951		1,863
Land		1,790		1,790
Construction in progress		3,661		2,794
Total		164,244		139,441
Less accumulated depreciation		(95,198)		(94,818)
Property and equipment, net		$	69,046	$	44,623

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(1)Amounts include tractors held under finance leases in our crude oil marketing segment. At December 31, 2019 and 2018, gross property and equipment associated with these assets held under finance leases were $5.5 million and $4.7 million, respectively. Accumulated amortization associated with these assets held under finance leases were $1.7 million and $0.7 million at December 31, 2019 and 2018, respectively (see Note 16 for further information).

(2)2019 amount includes a tank storage and throughput arrangement in our crude oil marketing segment held under a finance lease. Gross property and equipment associated with these assets held under a finance lease at December 31, 2019 was $3.3 million. Accumulated amortization associated with these assets held under a finance lease at December 31, 2019 was $0.7 million (see Note 16 for further information).

Components of depreciation, depletion and amortization expense were as follows for the periods indicated (in thousands):


	Year Ended December 31,
	2019		2018		2017
Depreciation, depletion and amortization, excluding amounts
under finance leases	$	14,833	$	10,112	$	13,478
Amortization of property and equipment under finance leases	1,808		542		121
Total depreciation, depletion and amortization	$	16,641	$	10,654	$	13,599

Pre-tax gain on the sale of equipment

We sold certain used tractors, trailers and other equipment and recorded net pre-tax gains as follows for the periods indicated (in thousands):


	Year Ended December 31,
	2019		2018		2017

Gains on sales of used tractors, trailers and equipment	$	1,400	$	1,240	$	594

Company's asset retirement obligations

The following table reflects a summary of our AROs for the periods indicated (in thousands):


	Year Ended December 31,
	2019		2018		2017

ARO liability at beginning of year	$	1,525	$	1,273	$	2,329
Liabilities incurred	17		252		18
Accretion of discount	48		36		58
Liabilities settled	(17)		(36)		(261)
Deconsolidation of subsidiary ⁽¹⁾	—		—		(871)
ARO liability at end of year	$	1,573	$	1,525	$	1,273

_______________

(1)Relates to our upstream crude oil and natural gas exploration and production subsidiary that was deconsolidated in April 2017 as a result of its bankruptcy filing (see Note 4 for further information).