Property and Equipment

9 Months Ended

Sep. 30, 2018

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	2018		2017

Tractors and trailers ⁽¹⁾	5 – 6	$	84,578	$	88,065
Field equipment	2 – 5	19,987		18,490
Buildings	5 – 39	15,746		15,727
Office equipment	2 – 5	1,808		1,929
Land		1,790		1,790
Construction in progress		1,664		275
Total		125,573		126,276
Less accumulated depreciation		(94,655)		(96,914)
Property and equipment, net		$	30,918	$	29,362

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(1) Amounts include assets held under capital leases for certain tractors in our marketing segment. Gross property and equipment associated with assets held under capital leases were $3.0 million and $1.8 million at September 30, 2018 and December 31, 2017, respectively. Accumulated amortization associated with assets held under capital leases were $0.4 million and $0.1 million at September 30, 2018 and December 31, 2017, respectively (see Note 12 for further information).

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


	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018		2017		2018		2017
Depreciation, depletion and amortization,
excluding amounts under capital leases	$	2,210	$	3,210	$	6,703	$	10,742
Amortization of property and equipment
under capital leases	130		30		311		30
Total depreciation, depletion and amortization	$	2,340	$	3,240	$	7,014	$	10,772