Property, Plant and Equipment

The following is a summary of property, plant and equipment at June 30, 2018 and December 31, 2017 (in thousands):



	Estimated Useful Lives in Years	June 30, 2018			December 31, 2017
Land	—	$	14,834		$	15,314
Land improvements ⁽¹⁾	8-15	15,110			14,594
Buildings and improvements ⁽¹⁾	39	110,092			119,380
Rental machinery and equipment	7	894,279			898,146
Machinery and equipment - other	7	61,603			55,049
Furniture, fixtures and computers	5	24,735			27,259
Automobiles and other vehicles	5	29,675			29,971
Leasehold improvements ⁽¹⁾	7-15, or lease term if shorter	11,903			10,030
Construction in progress - machinery and equipment and land improvements ⁽¹⁾	—	61,920			61,836
		1,224,151			1,231,579
Less: Accumulated depreciation		(802,117		)	(761,933		)
Total property, plant and equipment, net		$	422,034		$	469,646


⁽¹⁾	See Note 11 - Related Party Transactions for additional information.

During the third quarter of 2017, we committed to sell certain of our buildings in the International Services segment and determined those assets met the criteria to be classified as held for sale in our condensed consolidated balance sheet. As a result, we reclassified the buildings, with a net book value of $4.1 million, from property, plant and equipment to assets held for sale and recognized a $0.3 million loss. During the first quarter of 2018, we sold one of the buildings classified as held for sale for $0.8 million and recorded an immaterial loss. During the second quarter of 2018, additional assets with a net book value of $4.5 million met the criteria to be classified as held for sale and were reclassified from property, plant and equipment to assets held for sale on our condensed consolidated balance sheet.

The following table presents the depreciation and amortization expense associated with each line item for the three and six months ended June 30, 2018 and 2017 (in thousands):



	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Services	$	24,302	$	26,252	$	47,881	$	52,895
Products	1,131		1,252		2,268		2,561
General and administrative expenses	3,429		3,447		7,013		6,594
Total	$	28,862	$	30,951	$	57,162	$	62,050