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Summary of Significant Accounting Policies (Real Estate Investments) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 06, 2017 | Oct. 13, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Components of Real Estate Investments [Abstract] |  |  |  |  |
Land |  |  | $ 13,262 | $ 13,262 |
Buildings and improvements |  |  | 43,074 | 42,951 |
Total real estate investment |  |  | 56,336 | 56,213 |
Gain on sale of real estate investments |  |  | 0 | 6,903 | $ 10,419
Operating Leases, Future Minimum Payments Receivable [Abstract] |  |  |  |  |
2017 |  |  | 4,432 |  |
2018 |  |  | 4,513 |  |
2019 |  |  | 2,644 |  |
2020 |  |  | 1,184 |  |
2021 |  |  | 1,198 |  |
Thereafter |  |  | $ 5,565 |  |
CA Undeveloped Land |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |
Proceeds from sale of real estate held-for-investment | $ 1,350 |  |  |  |
Gain on sale of real estate investments | 580 |  |  |  |
Selling expense | 14 |  |  |  |
Arizona Warehouse Building |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  | $ 20,000 |  |  |
Gain on sale of real estate investments |  | 9,981 |  |  |
Selling expense |  | $ 112 |  |  |
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 |  |  | $ 56,090 | $ 55,966 |
444 West Santa Clara Street, L.P. [Member] |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |
Limited partership interest percentage |  |  | 70.00% |  |
444 West Santa Clara Street, L.P. [Member] | 444 West Santa Clara Street |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |
Proceeds from sale of real estate held-for-investment | 11,000 |  |  |  |
Gain on sale of real estate investments | 6,323 |  |  |  |
Selling expense | 1,157 |  |  |  |
Parent [Member] | 444 West Santa Clara Street |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |
Gain on sale of real estate investments | 4,427 |  |  |  |
Noncontrolling Interest [Member] | 444 West Santa Clara Street |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |
Gain on sale of real estate investments | $ 1,896 |  |  |  |

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