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Leases Lease- additional information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Leases [Abstract] |  |  |  |
Operating lease liabilities | $ 1,849 | $ 0 |  |
Operating lease liabilities | 11,739 | 0 |  |
Operating lease right-of-use assets | 13,168 | 0 |  | $ 7,600
Debt Instrument [Line Items] |  |  |  |
Notes Payable to Bank | 205,000 |  |  |
Operating Lease, Expense | 2,800 | $ 2,500 | $ 2,400 |
9.56% notes due 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes Payable to Bank | $ 28,000 |  |  |
Interest rate (as a percent) | 9.56% | 9.56% |  |
Golden State Water Company [Member] |  |  |  |
Leases [Abstract] |  |  |  |
Operating lease liabilities | $ 1,612 | $ 0 |  |
Operating lease liabilities | 11,588 | 0 |  |
Operating lease right-of-use assets | $ 12,745 | $ 0 |  |
Debt Instrument [Line Items] |  |  |  |
Ratio of Indebtedness to Net Capital | 0.4445 |  |  |
Golden State Water Company [Member] | 9.56% notes due 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) | 9.56% | 9.56% |  |
Golden State Water Company [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Ratio of Indebtedness to Net Capital | 0.6667 |  |  |

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- Definition Including the current and noncurrent portions, the carrying value as of the balance sheet date of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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