Business Segments (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Financial Data for Continuing Operation For Corporation's Reportable Business Segments

The following tables display selected financial data for continuing operations for the Corporation’s reportable business segments. Total revenues and net sales in the table below, as well as the consolidated statements of earnings and comprehensive earnings, exclude intersegment sales, which are eliminated.  

	Three Months Ended
	March 31,
	2016			2015
	(Dollars in Thousands)
Total revenues:
Mid-America Group	$	186,347		$	140,834
Southeast Group		71,671			64,678
West Group		392,995			320,571
Total Aggregates Business		651,013			526,083
Cement		73,551			102,100
Magnesia Specialties		64,170			63,164
Total	$	788,734		$	691,347
Net sales:
Mid-America Group	$	173,372		$	129,705
Southeast Group		67,284			59,770
West Group		363,926			287,082
Total Aggregates Business		604,582			476,557
Cement		69,873			96,565
Magnesia Specialties		59,505			58,754
Total	$	733,960		$	631,876
Earnings (Loss) from operations:
Mid-America Group	$	14,424		$	(4,203	)
Southeast Group		6,971			(1,548	)
West Group		38,797			14,499
Total Aggregates Business		60,192			8,748
Cement		26,316			12,229
Magnesia Specialties		20,563			17,789
Corporate		(23,302	)		(13,195	)
Total	$	83,769		$	25,571

Net Sales By Product Line

The Aggregates business includes the aggregates product line and aggregates-related downstream product lines, which include asphalt, ready mixed concrete and road paving product lines. All aggregates-related downstream product lines reside in the West Group. The following tables, which are reconciled to consolidated amounts, provide net sales and gross profit by line of business: Aggregates (further divided by product line), Cement and Magnesia Specialties.

	Three Months Ended
	March 31,
	2016			2015
	(Dollars in Thousands)
Net sales:
Aggregates	$	406,439		$	332,214
Asphalt		3,875			9,645
Ready Mixed Concrete		186,785			127,572
Road Paving		7,483			7,126
Total Aggregates Business		604,582			476,557
Cement		69,873			96,565
Magnesia Specialties		59,505			58,754
Total	$	733,960		$	631,876
Gross profit (loss):
Aggregates	$	81,083		$	41,417
Asphalt		(2,269	)		(1,463	)
Ready Mixed Concrete		18,086			2,084
Road Paving		(3,894	)		(3,311	)
Total Aggregates Business		93,006			38,727
Cement		32,556			18,985
Magnesia Specialties		22,970			20,178
Corporate		(3,898	)		(3,629	)
Total	$	144,634		$	74,261