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Summary of Significant Accounting Policies (Real Estate Investments) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 13, 2016 | Aug. 14, 2015 | Jun. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Land |  |  |  | $ 15,218 | $ 17,297 |
Buildings and improvements |  |  |  | 46,826 | 57,015 |
Intangibles |  |  |  | 149 | 149 |
Total real estate investment |  |  |  | 62,193 | 74,461 |
Gain on sale of real estate investment |  |  |  | 10,419 | 1,886 | $ 554
Operating Leases, Future Minimum Payments Receivable [Abstract] |  |  |  |  |  |
2017 |  |  |  | 4,753 |  |
2018 |  |  |  | 3,924 |  |
2019 |  |  |  | 3,609 |  |
2020 |  |  |  | 3,302 |  |
2021 |  |  |  | 2,441 |  |
Thereafter |  |  |  | $ 7,947 |  |
Arizona Warehouse Building [Member] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment | $ 20,000 |  |  |  |  |
Gain on sale of real estate investment | 9,981 |  |  |  |  |
Selling expense | $ 112 |  |  |  |  |
California Non-Utility Property Portfolio [Domain] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  | $ 2,015 |  |  |  |
Gain on sale of real estate investment |  | 1,886 |  |  |  |
Selling expense |  | $ 91 |  |  |  |
Texas Retail Buildings [Member] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  |  | $ 4,450 |  |  |
Gain on sale of real estate investment |  |  | 273 |  |  |
Selling expense |  |  | $ 169 |  |  |
Minimum [Member] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 7 years |  |
Maximum [Member] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 39 years |  |
Land and Building [Member] |  |  |  |  |  |
Assets Leased or Available for Lease [Abstract] |  |  |  |  |  |
Assets leased or available for lease |  |  |  | $ 61,179 | $ 73,658 |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 7 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 39 years |  |
Finite-Lived Intangible Assets [Member] | Minimum [Member] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 7 years |  |
Finite-Lived Intangible Assets [Member] | Maximum [Member] |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 12 years |  |

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of intangible assets related to Real Estate Investments having a reasonably expected period of economic benefit. + References No definition available. + Details
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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements. + 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 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + 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 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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