Investment in Mortgage Notes and Notes Receivable (Details) | 3 Months Ended | 6 Months Ended | | |
Mar. 31, 2021USD ($) | Jun. 30, 2021USD ($) | Jun. 30, 2020USD ($) | Jan. 01, 2021USD ($) | Dec. 31, 2020USD ($) |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 365,554,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 366,064,000 | | | $ 365,628,000 |
Mortgage Note and Notes Receivable Commitments | | 24,300,000 | | | |
Proceeds from Sale and Collection of Mortgage Notes Receivable | | 7,982,000 | $ 94,000 | | |
Notes Receivable | | $ 7,300,000 | | | 7,300,000 |
Number of Notes Receivable | | 1 | | | |
Financing Receivable, Allowance for Credit Loss | | $ 27,277,000 | $ 2,163,000 | $ 0 | 32,858,000 |
Provision for Loan, Lease, and Other Losses | | (5,581,000) | | | |
Financing Receivable, Allowance for Credit Loss, Writeoff | | 0 | | | |
Financing Receivable, Allowance for Credit Loss, Recovery | | $ 0 | | | |
Note, 8.0%, due May 2, 2024 [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
Number of Notes Receivable | | 1 | | | |
Note Receivable, Face Amount | | $ 15,500,000 | | | |
Note Receivable, Unfunded Commitment | | 8,500,000 | | | |
Provision for Loan, Lease, and Other Losses | | 24,000,000 | | | |
Mortgage Receivable [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
Mortgage Note and Notes Receivable Commitments | | 15,856,000 | | | |
Financing Receivable, Allowance for Credit Loss | | 3,114,000 | | | 7,000,000 |
Provision for Loan, Lease, and Other Losses | | (3,886,000) | | | |
Financing Receivable, Allowance for Credit Loss, Writeoff | | 0 | | | |
Financing Receivable, Allowance for Credit Loss, Recovery | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 9.02%, Prepaid in Full | Private School | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 9.02% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 0 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 0 | | | 5,278,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Proceeds from Sale and Collection of Mortgage Notes Receivable | $ 5,100,000 | | | | |
Prepaymentfee | $ 0 | | | | |
Mortgage Receivable [Member] | Mortgage Note, 7.75%, due June 30, 2025 [Member] | Attraction Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 7.75% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 28,349,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 27,699,000 | | | 27,045,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 7.85%, due January 3, 2027 [Member] | Fitness & Wellness Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 7.85% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 10,905,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 11,272,000 | | | 11,225,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 7.55%, due July 31, 2029 [Member] | Fitness & Wellness Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 7.55% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 9,090,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 9,387,000 | | | 9,355,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 8.23%, December 31, 2029 [Member] | Ski Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 8.23% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 41,852,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 42,018,000 | | | 40,680,000 |
Mortgage Note and Notes Receivable Commitments | | $ 15,148,000 | | | |
Mortgage Receivable [Member] | Mortgage Note, 7.85%, due June 30, 2030 [Member] | Fitness & Wellness Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 7.85% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 10,210,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 10,462,000 | | | 8,630,000 |
Mortgage Note and Notes Receivable Commitments | | $ 708,000 | | | |
Mortgage Receivable [Member] | Mortgage Note, 7.01%, due September 30, 2031 [Member] | Experiential Lodging Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 7.01% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 71,223,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 70,181,000 | | | 67,235,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 11.31%, due June 1, 2033 [Member] | Eat & Play Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 11.31% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 11,039,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 11,235,000 | | | 11,929,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 11.96%, due December 1, 2034 [Member] | Ski Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 11.96% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 51,050,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 51,044,000 | | | 51,031,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 10.91%, due December 1, 2034 [Member] | Ski Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 10.91% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 37,562,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 37,491,000 | | | 37,413,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 11.38%, due December 1, 2034 [Member] | Ski Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 11.38% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 4,550,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 4,500,000 | | | 4,396,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 8.72%, due January 5, 2036 [Member] | Ski Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 8.72% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 21,000,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 21,000,000 | | | 21,000,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, due May 31, 2036 [Member] | Eat & Play Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 10.25% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 17,505,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 17,781,000 | | | 18,289,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 9.75% due August 1, 2036 [Member] | Eat & Play Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 9.75% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 18,068,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 18,335,000 | | | 18,830,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 7.85% due January 31, 2038 [Member] | Fitness & Wellness Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 7.85% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 10,292,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 10,538,000 | | | 10,408,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 7.98%, due May 9, 2039 [Member] | early childhood education center [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 7.98% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 4,200,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 4,326,000 | | | 4,348,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 8.125%, due June 17, 2039 [Member] | Eat & Play Properties [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 8.13% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 14,700,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 14,799,000 | | | 14,799,000 |
Mortgage Note and Notes Receivable Commitments | | $ 0 | | | |
Mortgage Receivable [Member] | Mortgage Note, 8.42%, due October 31, 2019 [Member] | early childhood education center [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate | | 8.42% | | | |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | | $ 3,959,000 | | | |
Mortgage Loans on Real Estate, Commercial and Consumer, Net | | 3,996,000 | | | 3,737,000 |
Mortgage Note and Notes Receivable Commitments | | 0 | | | |
Unfunded Loan Commitment [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
Financing Receivable, Allowance for Credit Loss | | 90,000 | | | 138,000 |
Provision for Loan, Lease, and Other Losses | | (48,000) | | | |
Financing Receivable, Allowance for Credit Loss, Writeoff | | 0 | | | |
Financing Receivable, Allowance for Credit Loss, Recovery | | 0 | | | |
Notes Receivable [Member] | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
Financing Receivable, Allowance for Credit Loss | | 15,586,000 | | | 12,854,000 |
Provision for Loan, Lease, and Other Losses | | 2,732,000 | | | |
Financing Receivable, Allowance for Credit Loss, Writeoff | | 0 | | | |
Financing Receivable, Allowance for Credit Loss, Recovery | | 0 | | | |
Note Receivable Unfunded Loan Commitment | | | | | |
Financing Receivable, Allowance for Credit Loss [Line Items] | | | | | |
Financing Receivable, Allowance for Credit Loss | | 8,487,000 | | | $ 12,866,000 |
Provision for Loan, Lease, and Other Losses | | (4,379,000) | | | |
Financing Receivable, Allowance for Credit Loss, Writeoff | | 0 | | | |
Financing Receivable, Allowance for Credit Loss, Recovery | | $ 0 | | | |