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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 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 |
|  | June 30, 2019 |
|  | Products and Services |  | Freight |  | Total |
|  | (Dollars in Thousands) |
Mid-America Group |  | $ | 382,717 |  | $ | 32,610 |  | $ | 415,327 |
Southeast Group |  |  | 132,036 |  |  | 4,988 |  |  | 137,024 |
West Group |  |  | 611,003 |  |  | 39,875 |  |  | 650,878 |
Total Building Materials Business |  |  | 1,125,756 |  |  | 77,473 |  |  | 1,203,229 |
Magnesia Specialties |  |  | 70,379 |  |  | 5,860 |  |  | 76,239 |
Total |  | $ | 1,196,135 |  | $ | 83,333 |  | $ | 1,279,468 |
|  | Three Months Ended |
|  | June 30, 2018 |
|  | Products and Services |  | Freight |  | Total |
|  | (Dollars in Thousands) |
Mid-America Group |  | $ | 325,578 |  | $ | 25,014 |  | $ | 350,592 |
Southeast Group |  |  | 109,082 |  |  | 3,881 |  |  | 112,963 |
West Group |  |  | 625,960 |  |  | 39,926 |  |  | 665,886 |
Total Building Materials Business |  |  | 1,060,620 |  |  | 68,821 |  |  | 1,129,441 |
Magnesia Specialties |  |  | 68,157 |  |  | 4,805 |  |  | 72,962 |
Total |  | $ | 1,128,777 |  | $ | 73,626 |  | $ | 1,202,403 |
|  | Six Months Ended |
|  | June 30, 2019 |
|  | Products and Services |  | Freight |  | Total |
|  | (Dollars in Thousands) |
Mid-America Group |  | $ | 613,025 |  | $ | 51,115 |  | $ | 664,140 |
Southeast Group |  |  | 247,348 |  |  | 8,914 |  |  | 256,262 |
West Group |  |  | 1,074,514 |  |  | 73,194 |  |  | 1,147,708 |
Total Building Materials Business |  |  | 1,934,887 |  |  | 133,223 |  |  | 2,068,110 |
Magnesia Specialties |  |  | 139,553 |  |  | 10,760 |  |  | 150,313 |
Total |  | $ | 2,074,440 |  | $ | 143,983 |  | $ | 2,218,423 |
|  | Six Months Ended |
|  | June 30, 2018 |
|  | Products and Services |  | Freight |  | Total |
|  | (Dollars in Thousands) |
Mid-America Group |  | $ | 493,468 |  | $ | 35,905 |  | $ | 529,373 |
Southeast Group |  |  | 186,646 |  |  | 6,556 |  |  | 193,202 |
West Group |  |  | 1,068,943 |  |  | 70,665 |  |  | 1,139,608 |
Total Building Materials Business |  |  | 1,749,057 |  |  | 113,126 |  |  | 1,862,183 |
Magnesia Specialties |  |  | 133,025 |  |  | 9,199 |  |  | 142,224 |
Total |  | $ | 1,882,082 |  | $ | 122,325 |  | $ | 2,004,407 |
Summary of Information About the Company's Contract Balances | The following table presents information about the Company’s contract balances:
(Dollars in Thousands) |  | June 30, 2019 |  | December 31, 2018 |
Costs in excess of billings |  | $ | 9,452 |  | $ | 1,975 |
Billings in excess of costs |  | $ | 9,088 |  | $ | 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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