Business Segments (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Financial Data for Continuing Operation for Company's Reportable Business Segments

The following table displays selected financial data for the Company’s reportable business segments. Total revenues, as well as the consolidated statements of earnings and comprehensive earnings, exclude intersegment revenues which represent sales from one segment to another segment, which are eliminated. Prior-year information has been reclassified to conform to current year revenue presentation.  

	Three-Months Ended
	March 31,
	2018			2017
	(Dollars in Thousands)
Total revenues:
Mid-America Group	$	178,781		$	189,019
Southeast Group		80,239			90,282
West Group		473,722			495,981
Total Building Materials Business		732,742			775,282
Magnesia Specialties		69,262			68,577
Total	$	802,004		$	843,859
Products and services revenues:
Mid-America Group	$	167,890		$	177,407
Southeast Group		77,563			86,726
West Group		442,983			463,881
Total Building Materials Business		688,436			728,014
Magnesia Specialties		64,869			64,302
Total	$	753,305		$	792,316
Earnings (Loss) from operations:
Mid-America Group	$	6,167		$	13,342
Southeast Group		2,041			10,115
West Group		34,951			61,232
Total Building Materials Business		43,159			84,689
Magnesia Specialties		21,237			19,881
Corporate		(25,315	)		(27,420	)
Total	$	39,081		$	77,150