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Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Derivatives, Fair Value [Line Items] |  |
Fair value, liability derivatives | $ (109,040) | $ (39,061)
Fair value, asset derivatives | 10 | 2,583
Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 50,000 |
Core Portfolio |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 562,035 |
Fair value, derivatives, net | (89,962) | (33,294)
Core Portfolio | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 522,800 |
Fair value, liability derivatives | (89,962) | (33,750)
Core Portfolio | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 39,235 |
Derivative Effective Date | 2016-01 |
Derivative Maturity Date | 2020-07 |
Fair value, asset derivatives | $ 0 | 456
Core Portfolio | Interest Rate Swaps | Minimum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2012-12 |
Derivative Maturity Date | 2021-01 |
Strike Rate | 1.24% |
Core Portfolio | Interest Rate Swaps | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 1.29% |
Core Portfolio | Interest Rate Swaps | Maximum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2023-04 |
Derivative Maturity Date | 2033-04 |
Strike Rate | 3.77% |
Core Portfolio | Interest Rate Swaps | Maximum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 1.29% |
Fund Portfolio | Fund II |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 63,941 |
Fair value, derivatives, net | (340) | (138)
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 18,941 |
Derivative Effective Date | 2014-10 |
Derivative Maturity Date | 2021-11 |
Fair value, liability derivatives | $ (349) | (139)
Fund Portfolio | Fund II | Interest Rate Swaps | Minimum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.88% |
Fund Portfolio | Fund II | Interest Rate Swaps | Maximum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.88% |
Fund Portfolio | Fund II | Interest Rate Cap | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 45,000 |
Derivative Effective Date | 2019-03 |
Derivative Maturity Date | 2022-03 |
Fair value, asset derivatives | $ 9 | 1
Fund Portfolio | Fund II | Interest Rate Cap | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.50% |
Fund Portfolio | Fund II | Interest Rate Cap | Maximum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.50% |
Fund Portfolio | Fund IV |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 157,844 |
Fair value, derivatives, net | (2,334) | (790)
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 67,244 |
Fair value, liability derivatives | (2,335) | (812)
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 0 |
Fair value, asset derivatives | $ 0 | 22
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 | 4.00% |
Fund Portfolio | Fund IV | Interest Rate Cap | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 90,600 |
Fair value, asset derivatives | $ 1 | 0
Fund Portfolio | Fund IV | Interest Rate Cap | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2019-07 |
Derivative Maturity Date | 2020-12 |
Strike Rate | 3.00% |
Fund Portfolio | Fund IV | Interest Rate Cap | Maximum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2019-12 |
Derivative Maturity Date | 2021-07 |
Strike Rate | 3.50% |
Fund Portfolio | Fund III | Interest Rate Cap | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 39,470 |
Derivative Effective Date | 2020-01 |
Derivative Maturity Date | 2021-01 |
Fair value, asset derivatives | $ 0 | 0
Fund Portfolio | Fund III | Interest Rate Cap | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.00% |
Fund Portfolio | Fund III | Interest Rate Cap | Maximum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 3.00% |
Fund Portfolio | Fund V |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 334,505 |
Fair value, derivatives, net | (16,394) | (2,256)
Fund Portfolio | Fund V | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 334,505 |
Fair value, liability derivatives | (16,394) | (4,360)
Fund Portfolio | Fund V | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 0 |
Fair value, asset derivatives | $ 0 | $ 2,104
Fund Portfolio | Fund V | Interest Rate Swaps | Minimum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2018-01 |
Derivative Maturity Date | 2021-02 |
Strike Rate | 1.25% |
Fund Portfolio | Fund V | Interest Rate Swaps | Maximum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2019-11 |
Derivative Maturity Date | 2024-10 |
Strike Rate | 2.88% |

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