NOTE G—PROPERTY, PLANT AND MINE DEVELOPMENT

At June 30, 2018 and December 31, 2017, property, plant and mine development (in thousands) consisted of the following:



	June 30, 2018			December 31, 2017
Mining property and mine development	$	1,051,824		$	586,242
Asset retirement cost	14,308			14,184
Land	42,189			36,552
Land improvements	66,336			45,878
Buildings	73,150			56,330
Machinery and equipment	790,655			590,566
Furniture and fixtures	4,053			2,953
Construction-in-progress	183,222			189,970
	2,225,737			1,522,675
Accumulated depletion, depreciation and amortization	(400,084		)	(353,520		)
Total property, plant and mine development, net	$	1,825,653		$	1,169,155

At June 30, 2018 and December 31, 2017, the aggregate cost of machinery and equipment acquired under capital leases was $1.1 million and $0.9 million, respectively, reduced by accumulated depreciation of $0.2 million and $0.2 million, respectively. The amount of interest costs capitalized in property, plant and mine development was $3.3 million for the six months ended June 30, 2018. There were no interest costs capitalized for the six months ended June 30, 2017.

On March 21, 2018, we completed the sale of three transload facilities located in the Permian, Eagle Ford, and Marcellus Basins to CIG Logistics (“CIG”) for total consideration of $86.1 million, including the assumption by CIG of $2.2 million of Company obligations. Total cash consideration was $83.9 million. The consideration includes receipt of a vendor incentive from CIG to enter into master transloading service arrangements. Of the total consideration, $25.8 million was allocated to the fair value of the transload facilities, which had a net book value of $20.0 million and resulted in a gain on sale of $5.8 million. The consideration included a related asset retirement obligation of $2.1 million and an equipment note of $0.1 million assumed by CIG. In addition, $60.3 million of the consideration received in excess of the facilities' fair value was allocated to vendor incentives to be recognized as a reduction of costs using a service-level methodology over the contract lives of the transloading service arrangements. At June 30, 2018, vendor incentives of $10.6 million and $46.3 million were classified in accounts payable and accrued expenses and in other long-term obligations, respectively, on our balance sheet.

Separately, on March 21, 2018, we accrued $7.9 million in contract termination costs for facilities contracts operated by third-parties, which will not transfer to CIG. During the three months ended June 30, 2018, as a result of the final settlement of these contracts, we recorded a $2.7 million credit in selling, general and administrative expenses on our Income Statement.

During the three months ended June 30, 2018, we recorded a $16.2 million asset impairment related to the closure of our resin coating facility and associated product portfolio.