Property and Equipment

9 Months Ended

Sep. 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	September 30,		December 31,
	in Years	2019		2018

Tractors and trailers ⁽¹⁾	5 – 6	$	109,595	$	96,523
Field equipment ⁽²⁾	2 – 20	24,851		20,725
Buildings	5 – 39	16,003		15,746
Office equipment	2 – 5	1,951		1,863
Land		1,790		1,790
Construction in progress		3,427		2,794
Total		157,617		139,441
Less accumulated depreciation		(94,884)		(94,818)
Property and equipment, net		$	62,733	$	44,623

_______________

(1) Amounts include tractors held under finance leases 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 September 30, 2019 and December 31, 2018, respectively. Accumulated amortization associated with assets held under these finance leases were $1.5 million and $0.7 million at September 30, 2019 and December 31, 2018, respectively (see Note 13 for further information).

(2) At September 30, 2019, amount includes a tank storage and throughput arrangement held under a finance lease 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 $0.5 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						Nine Months Ended
	September 30,						September 30,
	2019		2018		2019		2018
Depreciation and amortization, excluding amounts
under finance leases	$	3,840	$	2,210	$	11,012	$	6,703
Amortization of property and equipment under
finance leases	553		130		1,254		311
Total depreciation and amortization	$	4,393	$	2,340	$	12,266	$	7,014