PROPERTY, PLANT & EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2018

PROPERTY, PLANT & EQUIPMENT [Abstract]

Property, Plant and Equipment

in thousands	2018	2017
Property, Plant & Equipment
Land and land improvements 1	$    2,823,092	$  2,742,285
Buildings	139,948	135,655
Machinery and equipment	5,106,918	4,740,212
Leasehold improvements	18,217	17,354
Deferred asset retirement costs	183,324	172,631
Construction in progress	186,120	161,175
Total, gross	$    8,457,619	$  7,969,312
Less allowances for depreciation, depletion
and amortization	4,220,312	4,050,381
Total, net	$    4,237,307	$  3,918,931

1 Includes depletable land, as follows: December 31, 2018 — $1,626,899 thousand and December 31, 2017 — $1,606,303 thousand.

Capitalized Interest Costs and Total Interest Costs Incurred

in thousands	2018	2017	2016
Capitalized interest cost	$          3,674	$        5,177	$        7,468
Total interest cost incurred before recognition
of the capitalized amount	141,651	300,699	141,544