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Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Feb. 29, 2020
Derivatives, Fair Value [Line Items] |  |  |
Fair value, liability derivatives | $ (54,827) | $ (90,139) |
Derivative Asset | 2 | 1 |
Interest Rate Swaps |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount |  | 30,400 | $ 50,000
Core Portfolio |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | 539,636 |  |
Fair value, derivatives, net | (46,731) | (74,990) |
Core Portfolio | Interest Rate Swaps | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | 539,636 |  |
Fair value, liability derivatives | $ 46,731 | 74,990 |
Core Portfolio | Interest Rate Swaps | Minimum | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Effective Date | 2012-12 |  |
Derivative Maturity Date | 2022-03 |  |
Strike Rate | 1.71% |  |
Core Portfolio | Interest Rate Swaps | Maximum | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Effective Date | 2020-07 |  |
Derivative Maturity Date | 2030-07 |  |
Strike Rate | 3.77% |  |
Fund Portfolio | Fund II |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | $ 63,588 |  |
Fair value, derivatives, net | (23) | (219) |
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | $ 18,588 |  |
Derivative Effective Date | 2014-10 |  |
Derivative Maturity Date | 2021-11 |  |
Fair value, liability derivatives | $ 23 | 219 |
Fund Portfolio | Fund II | Interest Rate Swaps | Minimum | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Strike Rate | 1.49% |  |
Fund Portfolio | Fund II | Interest Rate Swaps | Maximum | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Strike Rate | 1.49% |  |
Fund Portfolio | Fund II | Interest Rate Caps | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | $ 45,000 |  |
Derivative Effective Date | 2019-03 |  |
Derivative Maturity Date | 2022-03 |  |
Derivative Asset | $ 0 | 0 |
Fund Portfolio | Fund II | Interest Rate Caps | Minimum | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Strike Rate | 3.50% |  |
Fund Portfolio | Fund II | Interest Rate Caps | Maximum | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Strike Rate | 3.50% |  |
Fund Portfolio | Fund III | Interest Rate Caps | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | $ 35,970 |  |
Derivative Effective Date | 2021-01 |  |
Derivative Maturity Date | 2022-07 |  |
Derivative Asset | $ 0 | 0 |
Fund Portfolio | Fund III | Interest Rate Caps | Minimum | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Strike Rate | 3.00% |  |
Fund Portfolio | Fund III | Interest Rate Caps | Maximum | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Strike Rate | 3.00% |  |
Fund Portfolio | Fund IV |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | $ 113,723 |  |
Fair value, derivatives, net | (526) | (1,712) |
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | 42,385 |  |
Fair value, liability derivatives | $ 528 | 1,713 |
Fund Portfolio | Fund IV | Interest Rate Swaps | Minimum | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Effective Date | 2017-03 |  |
Derivative Maturity Date | 2022-04 |  |
Strike Rate | 1.48% |  |
Fund Portfolio | Fund IV | Interest Rate Swaps | Maximum | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Effective Date | 2019-12 |  |
Derivative Maturity Date | 2022-12 |  |
Strike Rate | 2.61% |  |
Fund Portfolio | Fund IV | Interest Rate Caps | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | $ 71,338 |  |
Derivative Asset | $ 2 | 1 |
Fund Portfolio | Fund IV | Interest Rate Caps | Minimum | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Effective Date | 2020-12 |  |
Derivative Maturity Date | 2022-12 |  |
Strike Rate | 3.00% |  |
Fund Portfolio | Fund IV | Interest Rate Caps | Maximum | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Effective Date | 2021-07 |  |
Derivative Maturity Date | 2023-07 |  |
Strike Rate | 3.50% |  |
Fund Portfolio | Fund V |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | $ 298,014 |  |
Fair value, derivatives, net | (7,545) | (13,217) |
Fund Portfolio | Fund V | Interest Rate Swaps | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate Notional Amount | 298,014 |  |
Fair value, liability derivatives | $ 7,545 | $ 13,217 |
Fund Portfolio | Fund V | Interest Rate Swaps | Minimum | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Effective Date | 2018-06 |  |
Derivative Maturity Date | 2022-02 |  |
Strike Rate | 0.23% |  |
Fund Portfolio | Fund V | Interest Rate Swaps | Maximum | Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Effective Date | 2021-02 |  |
Derivative Maturity Date | 2024-10 |  |
Strike Rate | 2.88% |  |

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