Property and Equipment

6 Months Ended

Jun. 30, 2020

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	June 30,		December 31,
	in Years	2020		2019

Tractors and trailers ⁽¹⁾	5 – 6	$	122,892	$	115,693
Field equipment ⁽²⁾	2 – 5	24,960		25,094
Buildings	5 – 39	14,939		16,055
Office equipment	2 – 5	1,387		1,951
Land		1,790		1,790
Construction in progress		712		3,661
Total		166,680		164,244
Less accumulated depreciation		(97,400)		(95,198)
Property and equipment, net		$	69,280	$	69,046

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(1)Amounts include tractors in our crude oil marketing segment and trailers in our transportation segment held under finance leases. At June 30, 2020 and December 31, 2019, gross property and equipment associated with these assets held under finance leases were $7.2 million and $5.5 million, respectively. Accumulated amortization associated with these assets held under these finance leases were $2.3 million and $1.7 million at June 30, 2020 and December 31, 2019, respectively (see Note 13 for further information).

(2)Amounts include a tank storage and throughput arrangement in our crude oil marketing segment held under a finance lease. At June 30, 2020 and December 31, 2019, gross property and equipment associated with these assets held under a finance lease were $3.3 million and $3.3 million, respectively. Accumulated amortization associated with these assets held under a finance lease was $1.3 million and $0.7 million at June 30, 2020 and December 31, 2019, respectively (see Note 13 for further information).

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


	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2020		2019		2020		2019

Depreciation and amortization, excluding amounts under finance leases	$	3,725	$	3,828	$	7,645	$	7,172
Amortization of property and equipment under finance leases	553		456		1,106		701
Total depreciation and amortization	$	4,278	$	4,284	$	8,751	$	7,873