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Net Investment in Leases (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) lease | May 31, 2019 USD ($) property | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) lease | Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | [1]
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 |  |  |  |  |  |  |  |  |
Payments to acquire real estate assets |  | $ 56,700 |  |  |  |  |  |  |  |
Number of properties acquired from lessee | 2 | 7 |  |  |  |  |  |  |  |
Purchase price for properties acquired from lessee | $ 42,000 | $ 44,100 |  |  |  |  |  |  |  |
Number of ground leases entered into | lease | 2 |  |  |  |  |  |  |  |  |
Loan receivable held for sale |  |  | $ 42,683 |  |  |  | $ 42,683 |  |  |
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 | 477,360 | [1] |  |  | 477,360 | [1] |  | $ 429,101
Cash interest income from sales-type leases |  |  | 7,000 |  | $ 1,500 |  | 7,300 |  | $ 10,700 |
Noncash interest income from sales-type leases |  |  | $ 2,500 |  | $ 6,900 |  | 19,600 |  | $ 14,300 |
Net Lease |  |  |  |  |  |  |  |  |  |
Net investment in leases [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds from net investment in leases |  |  |  |  |  |  | 8,700 |  |  |
Impairment loss |  |  |  |  |  |  | $ 2,300 |  |  |
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 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
[1] | Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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