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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Goodwill |
|  | 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 |  |  | 148,326 |  |  |  | 93,816 |  |  |  | — |  |  |  | 242,142 |
Divestitures |  |  | — |  |  |  | (927 | ) |  |  | — |  |  |  | (927 | )
Balance at June 30, 2018 |  | $ | 429,729 |  |  | $ | 143,235 |  |  | $ | 1,828,541 |  |  | $ | 2,401,505 |
Intangible Assets Subject to Amortization | Intangible assets subject to amortization consist of the following:
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Balance |
(Dollars in Thousands) |  | June 30, 2018 |
Noncompetition agreements |  | $ | 6,274 |  |  | $ | (6,162 | ) |  | $ | 112 |
Customer relationships |  |  | 65,348 |  |  |  | (19,480 | ) |  |  | 45,868 |
Operating permits |  |  | 458,952 |  |  |  | (29,790 | ) |  |  | 429,162 |
Use rights and other |  |  | 16,496 |  |  |  | (10,763 | ) |  |  | 5,733 |
Trade names |  |  | 12,800 |  |  |  | (9,076 | ) |  |  | 3,724 |
Total |  | $ | 559,870 |  |  | $ | (75,271 | ) |  | $ | 484,599 |
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:
|  | Building Materials Business |  |  | Magnesia Specialties |  |  | Total |
(Dollars in Thousands) |  | June 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 |
Schedule of Acquired Intangibles | 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 |  |  |
Estimated Amortization Expense of Intangible Assets | The estimated amortization expense for intangible assets for the second half of 2018 and for each of the next four years and thereafter is as follows:
(Dollars in Thousands) |  |  |  |
July - December 2018 |  | $ | 6,961 |
2019 |  |  | 13,724 |
2020 |  |  | 13,689 |
2021 |  |  | 12,998 |
2022 |  |  | 11,490 |
Thereafter |  |  | 425,737 |
Total |  | $ | 484,599 |

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