Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Schedule of Company's Total Revenues by Category for each Reportable Segment

The following table presents the Company’s total revenues by category for each reportable segment:

	Three Months Ended
	September 30, 2019
	Products and Services		Freight		Total
	(Dollars in Thousands)
Mid-America Group	$	411,045	$	37,713	$	448,758
Southeast Group		129,619		4,519		134,138
West Group		723,162		49,311		772,473
Total Building Materials Business		1,263,826		91,543		1,355,369
Magnesia Specialties		59,334		5,543		64,877
Total	$	1,323,160	$	97,086	$	1,420,246
	Three Months Ended
	September 30, 2018
	Products and Services		Freight		Total
	(Dollars in Thousands)
Mid-America Group	$	348,429	$	28,576	$	377,005
Southeast Group		121,661		3,886		125,547
West Group		603,763		39,802		643,565
Total Building Materials Business		1,073,853		72,264		1,146,117
Magnesia Specialties		68,365		5,158		73,523
Total	$	1,142,218	$	77,422	$	1,219,640

	Nine Months Ended
	September 30, 2019
	Products and Services		Freight		Total
	(Dollars in Thousands)
Mid-America Group	$	1,024,069	$	88,828	$	1,112,897
Southeast Group		376,967		13,432		390,399
West Group		1,797,677		122,505		1,920,182
Total Building Materials Business		3,198,713		224,765		3,423,478
Magnesia Specialties		198,886		16,304		215,190
Total	$	3,397,599	$	241,069	$	3,638,668
	Nine Months Ended
	September 30, 2018
	Products and Services		Freight		Total
	(Dollars in Thousands)
Mid-America Group	$	841,897	$	64,480	$	906,377
Southeast Group		308,306		10,443		318,749
West Group		1,672,707		110,467		1,783,174
Total Building Materials Business		2,822,910		185,390		3,008,300
Magnesia Specialties		201,390		14,357		215,747
Total	$	3,024,300	$	199,747	$	3,224,047

Summary of Information About the Company's Contract Balances

The following table presents information about the Company’s contract balances:

(Dollars in Thousands)	September 30, 2019		December 31, 2018
Costs in excess of billings	$	7,725	$	1,975
Billings in excess of costs	$	8,021	$	6,743