Property and Equipment

3 Months Ended

Mar. 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	March 31,		December 31,
	in Years	2019		2018

Tractors and trailers ⁽¹⁾	5 – 6	$	101,470	$	96,523
Field equipment	2 – 20	21,378		20,725
Buildings	5 – 39	15,821		15,746
Office equipment	2 – 5	1,886		1,863
Land		1,790		1,790
Construction in progress		1,918		2,794
Total		144,263		139,441
Less accumulated depreciation		(95,346)		(94,818)
Property and equipment, net		$	48,917	$	44,623

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(1) Amounts include assets held under finance leases for certain tractors in our marketing segment. Gross property and equipment associated with assets held under finance leases were $5.3 million and $4.7 million at March 31, 2019 and December 31, 2018, respectively. Accumulated amortization associated with assets held under finance leases were $0.9 million and $0.7 million at March 31, 2019 and December 31, 2018, respectively (see Note 12 for further information).

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


	Three Months Ended
	March 31,
	2019		2018
Depreciation and amortization, excluding amounts
under finance leases	$	3,344	$	2,322
Amortization of property and equipment under finance leases	245		90
Total depreciation and amortization	$	3,589	$	2,412