Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Property, Plant and Equipment, Net

Note F: Property, Plant and Equipment, Net

December 31

(add 000)	2017			2016
Land and land improvements	$	974,622		$	915,158
Mineral reserves and interests		1,162,289			1,114,560
Buildings		154,564			151,115
Machinery and equipment		4,006,619			3,766,975
Construction in progress		199,973			167,722
		6,498,067			6,115,530
Less accumulated depreciation, depletion and amortization		(2,905,254	)		(2,692,135	)
Total	$	3,592,813		$	3,423,395

The gross asset value and accumulated amortization for machinery and equipment recorded under capital leases at December 31 were as follows:

(add 000)	2017			2016
Machinery and equipment under capital leases	$	23,919		$	23,117
Less accumulated amortization		(11,243	)		(8,077	)
Total	$	12,676		$	15,040

Depreciation, depletion and amortization expense related to property, plant and equipment was $279,808,000, $268,935,000 and $246,874,000 for the years ended December 31, 2017, 2016 and 2015, respectively. Depreciation, depletion and amortization expense includes amortization of machinery and equipment under capital leases.

Interest cost of $3,616,000, $3,543,000 and $5,832,000 was capitalized during 2017, 2016 and 2015, respectively.

At December 31, 2017 and 2016, $57,665,000 and $58,332,000, respectively, of the Building Materials business’ net property, plant and equipment were located in foreign countries, namely the Bahamas and Canada.