Business Segments (Tables)

6 Months Ended

Jun. 30, 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						Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
	(Dollars in Thousands)
Total revenues:
Mid-America Group	$	278,676		$	257,649		$	465,023		$	398,482
Southeast Group		87,600			81,518			159,271			146,195
West Group		484,918			411,235			877,913			731,807
Total Aggregates Business		851,194			750,402			1,502,207			1,276,484
Cement		62,468			105,899			136,019			207,999
Magnesia Specialties		63,636			65,118			127,806			128,282
Total	$	977,298		$	921,419		$	1,766,032		$	1,612,765
Net sales:
Mid-America Group	$	258,988		$	237,415		$	432,360		$	367,120
Southeast Group		82,676			76,483			149,961			136,253
West Group		455,115			375,489			819,040			662,570
Total Aggregates Business		796,779			689,387			1,401,361			1,165,943
Cement		59,791			100,405			129,664			196,970
Magnesia Specialties		58,866			60,457			118,371			119,211
Total	$	915,436		$	850,249		$	1,649,396		$	1,482,124
Earnings (Loss) from operations:
Mid-America Group	$	80,552		$	66,894		$	94,976		$	62,691
Southeast Group		11,548			4,818			18,519			3,269
West Group		77,404			49,177			116,201			63,676
Total Aggregates Business		169,504			120,889			229,696			129,636
Cement		21,309			22,468			47,626			34,697
Magnesia Specialties		19,227			18,751			39,791			36,541
Corporate		(22,298	)		(25,124	)		(45,601	)		(38,319	)
Total	$	187,742		$	136,984		$	271,512		$	162,555

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 products. 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						Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
	(Dollars in Thousands)
Net sales:
Aggregates	$	516,283		$	481,616		$	922,721		$	813,830
Asphalt and Paving		65,609			58,021			76,967			74,790
Ready Mixed Concrete		214,887			149,750			401,673			277,323
Total Aggregates Business		796,779			689,387			1,401,361			1,165,943
Cement		59,791			100,405			129,664			196,970
Magnesia Specialties		58,866			60,457			118,371			119,211
Total	$	915,436		$	850,249		$	1,649,396		$	1,482,124
Gross profit (loss):
Aggregates	$	164,353		$	137,272		$	245,431		$	178,690
Asphalt and Paving		12,876			7,891			6,714			3,116
Ready Mixed Concrete		25,293			9,341			43,380			11,424
Total Aggregates Business		202,522			154,504			295,525			193,230
Cement		24,002			30,414			56,559			49,400
Magnesia Specialties		21,692			21,224			44,662			41,402
Corporate		(1,515	)		(5,989	)		(5,411	)		(9,618	)
Total	$	246,701		$	200,153		$	391,335		$	274,414