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General - Real Estate Investments (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2021 USD ($) | Sep. 28, 2020 USD ($) property | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Land |  |  | $ 14,168 |  | $ 14,168 |  | $ 14,168 |
Buildings and improvements |  |  | 44,597 |  | 44,597 |  | 43,961 |
Subtotal |  |  | 58,765 |  | 58,765 |  | 58,129 |
Less accumulated depreciation and amortization |  |  | 15,655 |  | 15,655 |  | 14,783 |
Real estate investments, net |  |  | 43,110 |  | 43,110 |  | $ 43,346 |
Sales agreement, holdback amount |  |  |  |  |  |  |  | $ 3,000
Gain on sale of real estate investments | $ 3,000 |  | $ 0 | $ 0 | $ 3,000 | $ 0 |  |
San Jose Water Company |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Gain on sale of real estate investments |  | $ 1,048 |  |  |  |  |  |
Number of properties sold | property |  | 6 |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  | $ 1,075 |  |  |  |  |  |
Real estate selling expenses |  | $ 22 |  |  |  |  |  |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 + Details
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