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Revenue Recognition (Tables) | 9 Months Ended
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Sep. 30, 2019
Revenue From Contract With Customer [Abstract] |
Schedule of Company's Total Revenues by Category for each Reportable Segment | The following table presents the Company’s total revenues by category for each reportable segment:
|  | Three Months Ended |
|  | September 30, 2019 |
|  | Products and Services |  | Freight |  | Total |
|  | (Dollars in Thousands) |
Mid-America Group |  | $ | 411,045 |  | $ | 37,713 |  | $ | 448,758 |
Southeast Group |  |  | 129,619 |  |  | 4,519 |  |  | 134,138 |
West Group |  |  | 723,162 |  |  | 49,311 |  |  | 772,473 |
Total Building Materials Business |  |  | 1,263,826 |  |  | 91,543 |  |  | 1,355,369 |
Magnesia Specialties |  |  | 59,334 |  |  | 5,543 |  |  | 64,877 |
Total |  | $ | 1,323,160 |  | $ | 97,086 |  | $ | 1,420,246 |
|  | Three Months Ended |
|  | September 30, 2018 |
|  | Products and Services |  | Freight |  | Total |
|  | (Dollars in Thousands) |
Mid-America Group |  | $ | 348,429 |  | $ | 28,576 |  | $ | 377,005 |
Southeast Group |  |  | 121,661 |  |  | 3,886 |  |  | 125,547 |
West Group |  |  | 603,763 |  |  | 39,802 |  |  | 643,565 |
Total Building Materials Business |  |  | 1,073,853 |  |  | 72,264 |  |  | 1,146,117 |
Magnesia Specialties |  |  | 68,365 |  |  | 5,158 |  |  | 73,523 |
Total |  | $ | 1,142,218 |  | $ | 77,422 |  | $ | 1,219,640 |
|  | Nine Months Ended |
|  | September 30, 2019 |
|  | Products and Services |  | Freight |  | Total |
|  | (Dollars in Thousands) |
Mid-America Group |  | $ | 1,024,069 |  | $ | 88,828 |  | $ | 1,112,897 |
Southeast Group |  |  | 376,967 |  |  | 13,432 |  |  | 390,399 |
West Group |  |  | 1,797,677 |  |  | 122,505 |  |  | 1,920,182 |
Total Building Materials Business |  |  | 3,198,713 |  |  | 224,765 |  |  | 3,423,478 |
Magnesia Specialties |  |  | 198,886 |  |  | 16,304 |  |  | 215,190 |
Total |  | $ | 3,397,599 |  | $ | 241,069 |  | $ | 3,638,668 |
|  | Nine Months Ended |
|  | September 30, 2018 |
|  | Products and Services |  | Freight |  | Total |
|  | (Dollars in Thousands) |
Mid-America Group |  | $ | 841,897 |  | $ | 64,480 |  | $ | 906,377 |
Southeast Group |  |  | 308,306 |  |  | 10,443 |  |  | 318,749 |
West Group |  |  | 1,672,707 |  |  | 110,467 |  |  | 1,783,174 |
Total Building Materials Business |  |  | 2,822,910 |  |  | 185,390 |  |  | 3,008,300 |
Magnesia Specialties |  |  | 201,390 |  |  | 14,357 |  |  | 215,747 |
Total |  | $ | 3,024,300 |  | $ | 199,747 |  | $ | 3,224,047 |
Summary of Information About the Company's Contract Balances | The following table presents information about the Company’s contract balances:
(Dollars in Thousands) |  | September 30, 2019 |  | December 31, 2018 |
Costs in excess of billings |  | $ | 7,725 |  | $ | 1,975 |
Billings in excess of costs |  | $ | 8,021 |  | $ | 6,743 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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