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Goodwill and Other Intangible Assets | 9 Months Ended
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Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets |
4. | Goodwill and Other Intangibles
|  | Mid-America |  |  | Southeast |  |  | West |  |  |  |  |
|  | Group |  |  | Group |  |  | Group |  |  | Total |
|  | (Dollars in Thousands) |
Balance at January 1, 2018 |  | $ | 281,403 |  |  | $ | 50,346 |  |  | $ | 1,828,541 |  |  | $ | 2,160,290 |
Acquisitions |  |  | 147,333 |  |  |  | 92,738 |  |  |  | — |  |  |  | 240,071 |
Divestitures |  |  | — |  |  |  | (927 | ) |  |  | — |  |  |  | (927 | )
Balance at September 30, 2018 |  | $ | 428,736 |  |  | $ | 142,157 |  |  | $ | 1,828,541 |  |  | $ | 2,399,434 |
4. | Goodwill and Other Intangibles (continued)
Intangible assets subject to amortization consist of the following:
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Balance |
(Dollars in Thousands) |  | September 30, 2018 |
Noncompetition agreements |  | $ | 12,024 |  |  | $ | (11,105 | ) |  | $ | 919 |
Customer relationships |  |  | 56,530 |  |  |  | (18,325 | ) |  |  | 38,205 |
Operating permits |  |  | 458,952 |  |  |  | (31,375 | ) |  |  | 427,577 |
Use rights and other |  |  | 19,564 |  |  |  | (10,789 | ) |  |  | 8,775 |
Trade names |  |  | 12,800 |  |  |  | (9,387 | ) |  |  | 3,413 |
Total |  | $ | 559,870 |  |  | $ | (80,981 | ) |  | $ | 478,889 |
Intangible assets deemed to have an indefinite life and not being amortized consist of the following:
|  | Building Materials Business |  |  | Magnesia Specialties |  |  | Total |
(Dollars in Thousands) |  | September 30, 2018 |
Operating permits |  | $ | 6,600 |  |  | $ | — |  |  | $ | 6,600 |
Use rights |  |  | 20,642 |  |  |  | — |  |  |  | 20,642 |
Trade names |  |  | 280 |  |  |  | 2,565 |  |  |  | 2,845 |
Total |  | $ | 27,522 |  |  | $ | 2,565 |  |  | $ | 30,087 |
Intangibles acquired during the year are as follows:
(Dollars in Thousands) |  | Amount |  |  | Weighted-average amortization period
Subject to amortization: |  |  |  |  |  |
Customer relationships |  | $ | 20,620 |  |  | 12 years
Not subject to amortization: |  |  |  |  |  |
Water rights |  |  | 1,100 |  |  | N/A
Total |  | $ | 21,720 |  |  |
4. | Goodwill and Other Intangibles (continued)
Total amortization expense for intangible assets for the nine-months ended September 30, 2018 and 2017 was $10,549,000 and $10,710,000, respectively. The estimated amortization expense for intangible assets for the last three months of 2018 and for each of the next four years and thereafter is as follows:
(Dollars in Thousands) |  |  |  |
October - December 2018 |  | $ | 3,398 |
2019 |  |  | 13,429 |
2020 |  |  | 13,393 |
2021 |  |  | 12,703 |
2022 |  |  | 11,232 |
Thereafter |  |  | 424,734 |
Total |  | $ | 478,889 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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