Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill

The following table shows the changes in goodwill by reportable segment and in total:

December 31	Mid- America Group			Southeast Group		West Group			Cement			Total
(add 000)	2015
Balance at beginning of period	$	282,117		$	50,346	$	852,436		$	883,900		$	2,068,799
Acquisitions		—			—		8,464			—			8,464
Adjustments to purchase price allocations		—			—		15,538			(18,634	)		(3,096	)
Divestitures		(714	)		—		(5,218	)		—			(5,932	)
Balance at end of period	$	281,403		$	50,346	$	871,220		$	865,266		$	2,068,235
	2014
Balance at beginning of period	$	263,967		$	50,346	$	302,308		$	—		$	616,621
Division reorganization		18,150			—		(18,150	)		—			—
Acquisitions		—			—		600,372			883,900			1,484,272
Divestitures		—			—		(32,094	)		—			(32,094	)
Balance at end of period	$	282,117		$	50,346	$	852,436		$	883,900		$	2,068,799

Intangible Assets Subject to Amortization

Intangible assets subject to amortization consist of the following:

December 31	Gross Amount		Accumulated Amortization			Net Balance
(add 000)	2015
Noncompetition agreements	$	6,274	$	(6,069	)	$	205
Customer relationships		35,805		(10,448	)		25,357
Operating permits		450,419		(12,294	)		438,125
Use rights and other		16,746		(8,030	)		8,716
Trade names		12,800		(3,408	)		9,392
Total	$	522,044	$	(40,249	)	$	481,795
	2014
Noncompetition agreements	$	6,274	$	(5,971	)	$	303
Customer relationships		36,610		(7,654	)		28,956
Operating permits		498,462		(5,575	)		492,887
Use rights and other		15,385		(6,940	)		8,445
Trade names		12,800		(1,143	)		11,657
Total	$	569,531	$	(27,283	)	$	542,248

Intangible Assets Deemed to Indefinite Life and Not Being Amortized

Intangible assets deemed to have an indefinite life and not being amortized consist of the following:

December 31	Aggregates Business		Cement		Magnesia Specialties		Total
(add 000)	2015
Operating permits	$	6,600	$	—	$	—	$	6,600
Use rights		10,175		9,137		—		19,312
Trade names		—		280		2,565		2,845
Total	$	16,775	$	9,417	$	2,565	$	28,757
	2014
Operating permits	$	6,600	$	—	$	—	$	6,600
Use rights		9,975		19,437		—		29,412
Trade names		—		14,380		2,565		16,945
Total	$	16,575	$	33,817	$	2,565	$	52,957

Schedule of Acquired Intangibles

During 2015, the Corporation acquired $2,953,000 of intangibles, consisting of the following:

(add 000, except year data)	Amount		Weighted-average amortization period
Subject to amortization:
Customer relationships	$	375	13.3 years
Operating permits		1,017	26.5 years
Use rights and other		1,361	22.1 years
		2,753	22.5 years
Not subject to amortization:
Use rights		200	N/A
		200
Total	$	2,953

Estimated Amortization Expense of Intangible Assets

The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows:

(add 000)
2016	$	13,431
2017		13,345
2018		12,557
2019		11,665
2020		11,630
Thereafter		419,167
Total	$	481,795