Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2018

Property Plant And Equipment [Abstract]

Property, Plant and Equipment, Net

Note G: Property, Plant and Equipment, Net

December 31

(add 000)	2018			2017
Land and land improvements	$	1,089,675		$	974,622
Mineral reserves and interests		2,506,817			1,162,289
Buildings		162,098			154,564
Machinery and equipment		4,357,705			4,006,619
Construction in progress		178,668			199,973
		8,294,963			6,498,067
Less: Accumulated depreciation, depletion and amortization		(3,137,734	)		(2,905,254	)
Total	$	5,157,229		$	3,592,813

Included in these amounts are the gross asset value and accumulated amortization for machinery and equipment recorded under capital leases at December 31 as follows:

(add 000)	2018			2017
Machinery and equipment under capital leases	$	24,931		$	23,919
Less: Accumulated amortization		(14,524	)		(11,243	)
Total	$	10,407		$	12,676

Depreciation, depletion and amortization expense related to property, plant and equipment was $326,099,000, $279,808,000 and $268,935,000 for the years ended December 31, 2018, 2017 and 2016, respectively. Depreciation, depletion and amortization expense includes amortization of machinery and equipment under capital leases.

Interest expense of $3,017,000, $3,616,000 and $3,543,000 was capitalized during 2018, 2017 and 2016, respectively.

At December 31, 2018 and 2017, $56,235,000 and $57,665,000, respectively, of the Building Materials business’ net property, plant and equipment were located in foreign countries, namely the Bahamas and Canada.