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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 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 |
|  | March 31, 2019 |
(Dollars in Thousands) |  | Products and Services |  | Freight |  | Total |
Mid-America Group |  | $ | 230,308 |  | $ | 18,505 |  | $ | 248,813 |
Southeast Group |  |  | 115,312 |  |  | 3,925 |  |  | 119,237 |
West Group |  |  | 463,511 |  |  | 33,320 |  |  | 496,831 |
Total Building Materials Business |  |  | 809,131 |  |  | 55,750 |  |  | 864,881 |
Magnesia Specialties |  |  | 69,174 |  |  | 4,900 |  |  | 74,074 |
Total |  | $ | 878,305 |  | $ | 60,650 |  | $ | 938,955 |
|  | Three Months Ended |
|  | March 31, 2018 |
(Dollars in Thousands) |  | Products and Services |  | Freight |  | Total |
Mid-America Group |  | $ | 167,890 |  | $ | 10,891 |  | $ | 178,781 |
Southeast Group |  |  | 77,563 |  |  | 2,676 |  |  | 80,239 |
West Group |  |  | 442,983 |  |  | 30,739 |  |  | 473,722 |
Total Building Materials Business |  |  | 688,436 |  |  | 44,306 |  |  | 732,742 |
Magnesia Specialties |  |  | 64,869 |  |  | 4,393 |  |  | 69,262 |
Total |  | $ | 753,305 |  | $ | 48,699 |  | $ | 802,004 |
Summary of Information About the Company's Contract Balances | The following table presents information about the Company’s contract balances:
(Dollars in Thousands) |  | March 31, 2019 |  | December 31, 2018 |
Costs in excess of billings |  | $ | 2,238 |  | $ | 1,975 |
Billings in excess of costs |  | $ | 5,814 |  | $ | 6,743 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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