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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Schedule of Operations (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |
Interest expense | $ 83,248,000 | $ 223,068,000 | $ 566,750,000
Total net interest income (expense) | 123,618,000 | 127,093,000 | 127,864,000
Unrealized gains (losses), net | 95,649,000 | (160,161,000) | 35,837,000
Income from real estate | 15,230,000 | 419,000 | 215,000
Total non-interest income | 171,741,000 | (359,792,000) | 94,448,000
General and administrative expenses | 48,908,000 | 42,228,000 | 35,794,000
Expenses related to real estate | 104,425,000 | 54,563,000 | 49,835,000
Net income (loss) | 188,476,000 | (288,243,000) | 172,896,000
Net loss (income) attributable to non-controlling interest in consolidated variable interest entities | 4,724,000 | (267,000) | 840,000
Net income (loss) attributable to Company | 193,200,000 | (288,510,000) | 173,736,000
Depreciation | 5,700,000 | 200,000 | 0
VIE, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Net loss (income) attributable to non-controlling interest in consolidated variable interest entities | 704,000 |  |
Depreciation | 4,800,000 | 200,000 |
Amortization expense related to lease intangibles | 13,600,000 | 200,000 |
VIE, Primary Beneficiary | Financing And Other VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Interest income | 40,944,000 | 197,035,000 | 539,990,000
Interest expense | 31,612,000 | 161,425,000 | 460,075,000
Total net interest income (expense) | 9,332,000 | 35,610,000 | 79,915,000
Unrealized gains (losses), net | 23,832,000 | (43,024,000) | 23,879,000
Income from real estate | 12,339,000 | 419,000 | 215,000
Other loss | 0 | (2,667,000) | (2,424,000)
Total non-interest income | 36,171,000 | (45,272,000) | 21,670,000
General and administrative expenses |  |  | 219,000
Expenses related to real estate | 25,687,000 | 763,000 | 482,000
Total general, administrative and operating expenses |  |  | 701,000
Net income (loss) | 19,816,000 | (10,425,000) | 100,884,000
Net loss (income) attributable to non-controlling interest in consolidated variable interest entities | 4,724,000 | (267,000) | 840,000
Net income (loss) attributable to Company | 24,540,000 | (10,692,000) | 101,724,000
VIE, Primary Beneficiary | Consolidated K-Series |  |  |
Variable Interest Entity [Line Items] |  |  |
Interest income |  | 151,841,000 | 535,226,000
Interest expense |  | 129,762,000 | 457,130,000
Total net interest income (expense) |  | 22,079,000 | 78,096,000
Unrealized gains (losses), net |  | (10,951,000) | 23,962,000
Income from real estate |  | 0 | 0
Other loss |  | 0 | 0
Total non-interest income |  | (10,951,000) | 23,962,000
General and administrative expenses |  |  | 0
Expenses related to real estate |  | 0 | 0
Total general, administrative and operating expenses |  |  | 0
Net income (loss) |  | 11,128,000 | 102,058,000
Net income (loss) attributable to Company |  | 11,128,000 | 102,058,000
VIE, Primary Beneficiary | Consolidated SLST |  |  |
Variable Interest Entity [Line Items] |  |  |
Interest income | 40,944,000 | 45,194,000 | 4,764,000
Interest expense | 28,135,000 | 31,663,000 | 2,945,000
Total net interest income (expense) | 12,809,000 | 13,531,000 | 1,819,000
Unrealized gains (losses), net | 23,832,000 | (32,073,000) | (83,000)
Income from real estate | 0 | 0 | 0
Other loss | 0 | 0 | 0
Total non-interest income | 23,832,000 | (32,073,000) | (83,000)
General and administrative expenses |  |  | 0
Expenses related to real estate | 0 | 0 | 0
Total general, administrative and operating expenses |  |  | 0
Net income (loss) | 36,641,000 | (18,542,000) | 1,736,000
Net income (loss) attributable to Company | 36,641,000 | (18,542,000) | 1,736,000
VIE, Primary Beneficiary | Consolidated Real Estate |  |  |
Variable Interest Entity [Line Items] |  |  |
Interest income | 0 | 0 | 0
Interest expense | 3,477,000 | 0 | 0
Total net interest income (expense) | (3,477,000) | 0 | 0
Unrealized gains (losses), net | 0 | 0 | 0
Income from real estate | 12,339,000 | 419,000 | 215,000
Other loss | 0 | (2,667,000) | (2,424,000)
Total non-interest income | 12,339,000 | (2,248,000) | (2,209,000)
General and administrative expenses |  |  | 219,000
Expenses related to real estate | 25,687,000 | 763,000 | 482,000
Total general, administrative and operating expenses |  |  | 701,000
Net income (loss) | (16,825,000) | (3,011,000) | (2,910,000)
Net loss (income) attributable to non-controlling interest in consolidated variable interest entities | 4,724,000 | (267,000) | 840,000
Net income (loss) attributable to Company | $ (12,101,000) | $ (3,278,000) | $ (2,070,000)

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