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Revenue from contracts with customers (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | In the following table, revenue is disaggregated by the type of customer or service provided. The Company believes this level of disaggregation best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The table also includes a reconciliation of the disaggregated revenue by reportable segments. For more information on the Company's business segments, see Note 16.
Year ended December 31, 2019 | Electric |  | Natural gas distribution |  | Pipeline and midstream |  | Construction materials and contracting |  | Construction services |  | Other |  | Total |
| (In thousands)
Residential utility sales | $ | 125,369 |  | $ | 483,452 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 608,821 |
Commercial utility sales | 141,596 |  | 296,835 |  | — |  | — |  | — |  | — |  | 438,431 |
Industrial utility sales | 37,765 |  | 26,895 |  | — |  | — |  | — |  | — |  | 64,660 |
Other utility sales | 7,408 |  | — |  | — |  | — |  | — |  | — |  | 7,408 |
Natural gas transportation | — |  | 45,449 |  | 101,665 |  | — |  | — |  | — |  | 147,114 |
Natural gas gathering | — |  | — |  | 9,164 |  | — |  | — |  | — |  | 9,164 |
Natural gas storage | — |  | — |  | 11,708 |  | — |  | — |  | — |  | 11,708 |
Contracting services | — |  | — |  | — |  | 1,088,633 |  | — |  | — |  | 1,088,633 |
Construction materials | — |  | — |  | — |  | 1,627,833 |  | — |  | — |  | 1,627,833 |
Intrasegment eliminations* | — |  | — |  | — |  | (525,749 | ) | — |  | — |  | (525,749 | )
Inside specialty contracting | — |  | — |  | — |  | — |  | 1,266,196 |  | — |  | 1,266,196 |
Outside specialty contracting | — |  | — |  | — |  | — |  | 531,882 |  | — |  | 531,882 |
Other | 35,574 |  | 12,726 |  | 17,687 |  | — |  | 131 |  | 16,551 |  | 82,669 |
Intersegment eliminations | — |  | — |  | (56,252 | ) | (1,066 | ) | (3,370 | ) | (16,461 | ) | (77,149 | )
Revenues from contracts with customers | 347,712 |  | 865,357 |  | 83,972 |  | 2,189,651 |  | 1,794,839 |  | 90 |  | 5,281,621 |
Revenues out of scope | 4,013 |  | (135 | ) | 220 |  | — |  | 51,057 |  | — |  | 55,155 |
Total external operating revenues | $ | 351,725 |  | $ | 865,222 |  | $ | 84,192 |  | $ | 2,189,651 |  | $ | 1,845,896 |  | $ | 90 |  | $ | 5,336,776 |
* | Intrasegment revenues are presented within the construction materials and contracting segment to highlight the focus on vertical integration as this segment sells materials to both third parties and internal customers. Due to consolidation requirements, these revenues must be eliminated against construction materials to arrive at the external operating revenue total for the segment.
Year ended December 31, 2018 | Electric |  | Natural gas distribution |  | Pipeline and midstream |  | Construction materials and contracting |  | Construction services |  | Other |  | Total |
| (In thousands)
Residential utility sales | $ | 121,477 |  | $ | 457,959 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 579,436 |
Commercial utility sales | 136,236 |  | 276,716 |  | — |  | — |  | — |  | — |  | 412,952 |
Industrial utility sales | 34,353 |  | 24,603 |  | — |  | — |  | — |  | — |  | 58,956 |
Other utility sales | 7,556 |  | — |  | — |  | — |  | — |  | — |  | 7,556 |
Natural gas transportation | — |  | 43,238 |  | 89,159 |  | — |  | — |  | — |  | 132,397 |
Natural gas gathering | — |  | — |  | 9,159 |  | — |  | — |  | — |  | 9,159 |
Natural gas storage | — |  | — |  | 11,543 |  | — |  | — |  | — |  | 11,543 |
Contracting services | — |  | — |  | — |  | 968,755 |  | — |  | — |  | 968,755 |
Construction materials | — |  | — |  | — |  | 1,423,068 |  | — |  | — |  | 1,423,068 |
Intrasegment eliminations* | — |  | — |  | — |  | (465,969 | ) | — |  | — |  | (465,969 | )
Inside specialty contracting | — |  | — |  | — |  | — |  | 926,875 |  | — |  | 926,875 |
Outside specialty contracting | — |  | — |  | — |  | — |  | 392,544 |  | — |  | 392,544 |
Other | 31,568 |  | 14,579 |  | 18,865 |  | — |  | 525 |  | 11,259 |  | 76,796 |
Intersegment eliminations | — |  | — |  | (50,905 | ) | (669 | ) | (1,681 | ) | (11,052 | ) | (64,307 | )
Revenues from contracts with customers | 331,190 |  | 817,095 |  | 77,821 |  | 1,925,185 |  | 1,318,263 |  | 207 |  | 4,469,761 |
Revenues out of scope | 3,933 |  | 6,152 |  | 197 |  | — |  | 51,509 |  | — |  | 61,791 |
Total external operating revenues | $ | 335,123 |  | $ | 823,247 |  | $ | 78,018 |  | $ | 1,925,185 |  | $ | 1,369,772 |  | $ | 207 |  | $ | 4,531,552 |
* | Intrasegment revenues are presented within the construction materials and contracting segment to highlight the focus on vertical integration as this segment sells materials to both third parties and internal customers. Due to consolidation requirements, these revenues must be eliminated against construction materials to arrive at the external operating revenue total for the segment.
Contract balances | The changes in contract assets and liabilities were as follows:
| December 31, 2019 |  | December 31, 2018 |  | Change |  | Location on Consolidated Balance Sheets
| (In thousands) |  |
Contract assets | $ | 109,078 |  | $ | 104,239 |  | $ | 4,839 |  | Receivables, net
Contract liabilities - current | (142,768 | ) | (93,901 | ) | (48,867 | ) | Accounts payable
Contract liabilities - noncurrent | (19 | ) | (135 | ) | 116 |  | Deferred credits and other liabilities - other
Net contract assets (liabilities) | $ | (33,709 | ) | $ | 10,203 |  | $ | (43,912 | ) |
| December 31, 2018 |  | December 31, 2017 |  | Change |  | Location on Consolidated Balance Sheets
| (In thousands) |  |
Contract assets | $ | 104,239 |  | $ | 109,540 |  | $ | (5,301 | ) | Receivables, net
Contract liabilities - current | (93,901 | ) | (84,123 | ) | (9,778 | ) | Accounts payable
Contract liabilities - noncurrent | (135 | ) | — |  | (135 | ) | Deferred credits and other liabilities - other
Net contract assets | $ | 10,203 |  | $ | 25,417 |  | $ | (15,214 | ) |

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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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