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Other Investments - Net Lease Venture II (Details) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) ft² lease building | May 31, 2019 USD ($) | Dec. 31, 2018 USD ($) lease building | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Commitment to provide loan to lessee | $ 150,000 |  |  |  |
Number of units to be built | building | 3 |  |  |  |
Acquisitions of real estate assets |  | $ 56,700 |  | $ 0 | $ 109,663
Remaining lease term | 6 years |  |  |  |
Net Lease Venture II |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity interest (percent) |  |  |  | 51.90% |
Net Lease Venture II | Other income |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Management fee revenue from related party |  |  |  | $ 400 | $ 400
Net Lease Venture II | The Properties Livermore CA |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of properties | building | 2 |  | 4 |  |
Acquisitions of real estate assets | $ 81,800 |  | $ 31,200 |  |
Percentage of acquired properties leased (percent) | 100.00% |  | 100.00% |  |
Number of leases | lease | 2 |  | 4 |  |
Area of properties (sq ft) | ft² | 168,636 |  |  |  |
Management Fees | Net Lease Venture II | Other income |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Amount of loan funded |  |  |  | $ 47,800 |
Master Lease | Management Fees | Net Lease Venture II | Other income |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Term of master lease | 25 years |  |  |  |

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