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California Water Service Group Stock Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Shares of California Water Service Group held |  | 100,000 |  |
Available for Sale Marketable Security, Shares Sold | 159,151 |  |  |
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $ 4,510 |  |  |
Fees Incurred on Sale of Available for Sale Securities | 20 |  |  |
Available-for-sale Securities, Gross Realized Gain (Loss) | 3,197 | $ 0 | $ 3,197 | $ 0
Available for Sales Securities, Tax on Realized Gain | 1,303 |  |  |
Gain (Loss) on Sale of Securities, Net | 1,894 |  |  |
Reclassification adjustment from AOCI for sale of securities, net | $ 1,742 | 0 | 1,742 | $ 0
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Investment in California Water Service Group |  | $ 4,535 | $ 3,390 |

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