GOODWILL (Tables)

6 Months Ended

Jun. 30, 2018

GOODWILL [Abstract]

Changes in Carrying Amount of Goodwill by Reportable Segment

in thousands	Aggregates	Asphalt	Concrete	Calcium	Total
Goodwill
Total as of December 31, 2017	$    3,030,688	$     91,633	$              0	$              0	$    3,122,321
Goodwill of acquired businesses 1	41,633	0	0	0	41,633
Total as of June 30, 2018	$    3,072,321	$     91,633	$              0	$              0	$    3,163,954

1 See Note 16 for a summary of acquisitions.