Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

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)	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
	2013
Balance at beginning of period	$	263,868	$	50,001	$	302,335		$	—	$	616,204
Acquisitions		99		345		—			—		444
Adjustments to purchase price allocations		—		—		(27	)		—		(27	)
Balance at end of period	$	263,967	$	50,346	$	302,308		$	—	$	616,621

Intangible assets subject to amortization consist of the following:

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

During 2014, the Corporation acquired $559,277,000 of intangibles from the Texas Industries Inc. (“TXI”) acquisition, consisting of the following:

(add 000)	Amount		Weighted-average amortization period
Subject to amortization:
Customer relationships	$	20,150	12.0 years
Operating permits		487,100	87.3 years
Use rights and other		4,820	8.2 years
Trade names		12,800	6.0 years
		524,870	81.7 years
Not subject to amortization:
Trade names		14,380	N/A
Use rights		20,027
		34,407
Total	$	559,277

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