Property and Equipment (Tables)

6 Months Ended

Jun. 30, 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	June 30,		December 31,
	in Years	2019		2018

Tractors and trailers ⁽¹⁾	5 – 6	$	106,046	$	96,523
Field equipment ⁽²⁾	2 – 20	24,895		20,725
Buildings	5 – 39	16,003		15,746
Office equipment	2 – 5	1,923		1,863
Land		1,790		1,790
Construction in progress		2,538		2,794
Total		153,195		139,441
Less accumulated depreciation		(97,640)		(94,818)
Property and equipment, net		$	55,555	$	44,623

_______________

(1) Amounts include assets held under finance leases for certain tractors in our marketing segment. Gross property and equipment associated with these assets held under finance leases were $5.5 million and $4.7 million at June 30, 2019 and December 31, 2018, respectively. Accumulated amortization associated with assets held under these finance leases were $1.2 million and $0.7 million at June 30, 2019 and December 31, 2018, respectively (see Note 13 for further information).

(2) At June 30, 2019, amount includes assets held under finance leases for certain tank storage and throughput arrangements in our marketing segment. Gross property and equipment associated with these assets held under finance leases were $3.3 million. Accumulated amortization associated with these assets held under finance leases was $0.2 million (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,
	2019		2018		2019		2018
Depreciation and amortization, excluding amounts
under finance leases	$	3,828	$	2,171	$	7,172	$	4,493
Amortization of property and equipment under
finance leases	456		91		701		181
Total depreciation and amortization	$	4,284	$	2,262	$	7,873	$	4,674