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Net Investment in Leases (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) lease property | May 31, 2019 USD ($) property item | Sep. 30, 2020 USD ($) lease | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($)
Net investment in leases [Line Items] |  |  |  |  |
Obligation to acquire the Ground Leases or fund the leasehold improvement allowances if certain construction conditions are not met within a specified time period | $ 0 |  |  |  |
Number of bowling centers acquired | item |  | 7 |  |  |
Payments to acquire real estate assets |  | $ 56,700 |  |  |
Number of properties acquired from lessee | property | 2 | 7 |  |  |
Purchase price for properties acquired from lessee |  | $ 44,100 |  |  |
Number of ground leases entered into | lease | 2 |  |  |  |
Loan receivable held for sale |  |  |  |  | $ 43,215
Extension of existing master net leases |  | 15 years |  |  |
Net proceeds from sale of lessee's facilities |  |  |  | $ 10,000 |
Term of rent deferral granted for lessee |  |  | 9 months |  |
Number of master leases | lease |  |  | 2 |  |
Net investment in leases |  | $ 424,100 |  |  | 43,215
Noncash interest income from sales-type leases |  |  |  |  | $ 1,200
Bowling Entertainment Venue Operator |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |
Number of bowling centers acquired | property |  | 9 |  |  |
Bowling Entertainment Venue Operator | Bowling Center Commitment |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |
Commitment to invest additional bowling centers |  | $ 55,000 | $ 55,000 |  |
Loans Receivable Held-for-sale |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |
Loan receivable held for sale | $ 42,000 |  |  |  |
Land Parcel One |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |
Purchase price for properties acquired from lessee | $ 42,000 |  |  |  |
Number of ground leases classified as sales-type lease | lease | 1 |  |  |  |
Land Parcel One | Maximum |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |
Leasehold improvement allowance, Ground Leases | $ 83,000 |  |  |  |
Land Parcel Two |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |
Purchase price for properties acquired from lessee | $ 42,000 |  |  |  |
Number of ground leases accounted for as a financing transaction | lease | 1 |  |  |  |
Land Parcel Two | Maximum |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |
Leasehold improvement allowance, Ground Leases | $ 83,000 |  |  |  |
Land Parcel Two | Loans Receivable Held-for-sale |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |
Loan receivable held for sale | $ 42,000 |  |  |  |

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