Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2018

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
	March 31, 2018
(Dollars in Thousands)	Products and Services		Freight		Total
Mid-America Group	$	167,890	$	10,891	$	178,781
Southeast Group		77,563		2,676		80,239
West Group		442,983		30,739		473,722
Total Building Materials Business		688,436		44,306		732,742
Magnesia Specialties		64,869		4,393		69,262
Total	$	753,305	$	48,699	$	802,004
	Three-Months Ended
	March 31, 2017
(Dollars in Thousands)	Products and Services		Freight		Total
Mid-America Group	$	177,407	$	11,612	$	189,019
Southeast Group		86,726		3,556		90,282
West Group		463,881		32,100		495,981
Total Building Materials Business		728,014		47,268		775,282
Magnesia Specialties		64,302		4,275		68,577
Total	$	792,316	$	51,543	$	843,859

Service revenues, which includes paving operations located in Colorado, were $11,143,000 and $16,000,000 for the three-months ended March 31, 2018 and 2017, respectively.

Summary of Information About the Company's Contract Balances

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

(Dollars in Thousands)	March 31, 2018		December 31, 2017		March 31, 2017
Costs in excess of billings	$	2,827	$	1,310	$	1,815
Billings in excess of costs	$	6,136	$	7,204	$	5,953