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Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |
Fair value, liability derivatives | $ (37,354) | $ (7,304)
Fair value, asset derivatives | 1,057 | 7,018
Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 156,000 |
Core Portfolio |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 587,574 |
Fair value, derivatives, net | $ (30,545) | (310)
Core Portfolio | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2020-07 |
Fair value, liability derivatives | $ (10,600) | (2,900)
Core Portfolio | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 424,074 |
Fair value, liability derivatives | (31,570) | (6,332)
Core Portfolio | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 163,500 |
Fair value, asset derivatives | $ 1,025 | 6,022
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 | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2014-10 |
Derivative Maturity Date | 2019-11 |
Strike Rate | 1.24% |
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% |
Core Portfolio | Interest Rate Swaps | Maximum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2016-07 |
Derivative Maturity Date | 2021-06 |
Strike Rate | 1.70% |
Fund Portfolio | Fund II |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 42,501 |
Fair value, derivatives, net | (141) | 108
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 19,201 |
Derivative Effective Date | 2014-10 |
Derivative Maturity Date | 2021-11 |
Fair value, liability derivatives | $ (150) | 0
Fund Portfolio | Fund II | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair value, asset derivatives | $ 0 | 108
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 | $ 23,300 |
Derivative Effective Date | 2019-03 |
Derivative Maturity Date | 2022-03 |
Fair value, asset derivatives | $ 9 | 0
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 | $ 202,114 |
Fair value, derivatives, net | (855) | 859
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 70,114 |
Fair value, liability derivatives | (878) | 0
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 23,100 |
Derivative Effective Date | 2017-03 |
Derivative Maturity Date | 2020-03 |
Fair value, asset derivatives | $ 23 | 851
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 | 1.97% |
Fund Portfolio | Fund IV | Interest Rate Swaps | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 1.82% |
Fund Portfolio | Fund IV | Interest Rate Swaps | Maximum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2019-05 |
Derivative Maturity Date | 2022-12 |
Strike Rate | 4.00% |
Fund Portfolio | Fund IV | Interest Rate Swaps | Maximum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 1.82% |
Fund Portfolio | Fund IV | Interest Rate Cap | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 108,900 |
Fair value, asset derivatives | $ 0 | 8
Fund Portfolio | Fund IV | Interest Rate Cap | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2016-07 |
Derivative Maturity Date | 2019-08 |
Strike Rate | 3.00% |
Fund Portfolio | Fund IV | Interest Rate Cap | Maximum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2016-11 |
Derivative Maturity Date | 2019-12 |
Strike Rate | 3.00% |
Fund Portfolio | Fund III | Interest Rate Cap | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 58,000 |
Derivative Effective Date | 2016-12 |
Derivative Maturity Date | 2020-01 |
Fair value, asset derivatives | $ 0 | 8
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 | $ 156,900 |
Fair value, derivatives, net | (4,756) | (951)
Fund Portfolio | Fund V | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 156,900 |
Fair value, liability derivatives | (4,756) | (972)
Fund Portfolio | Fund V | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 0 |
Fair value, asset derivatives | $ 0 | $ 21
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 | 2.27% |
Fund Portfolio | Fund V | Interest Rate Swaps | Maximum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2019-03 |
Derivative Maturity Date | 2024-03 |
Strike Rate | 2.88% |

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