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Business Segments: (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Details of reportable segment |  |  |  |  |
Income tax expense (benefit) | $ 4,387 | $ 14,307 | $ 6,951 | $ 21,162 |
Total utility plant | 1,238,789 | 1,155,203 | 1,238,789 | 1,155,203 | $ 1,204,992
Other assets | 202,333 | 307,450 | 202,333 | 307,450 |
Total Assets | 1,441,122 | 1,462,653 | 1,441,122 | 1,462,653 | 1,416,734
GOLDEN STATE WATER COMPANY |  |  |  |  |
Details of reportable segment |  |  |  |  |
Income tax expense (benefit) | 4,214 | 12,149 | 6,329 | 18,422 |
Depreciation on transportation equipment | 61 | $ 59 | 121 | $ 120 |
Total utility plant | 1,227,371 |  | 1,227,371 |  | 1,197,940
Total Assets | $ 1,341,075 |  | $ 1,341,075 |  | $ 1,326,823

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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