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Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |
Fair value, liability derivatives | $ (17,374) | $ (7,304)
Fair value, asset derivatives | 3,528 | 7,018
Derivative financial instruments (Note 8) | 3,528 | 7,018
Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 100,000 |
Core Portfolio |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 531,885 |
Fair value, derivatives, net | $ (11,975) | (310)
Core Portfolio | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2020-07 |
Fair value, liability derivatives | $ (6,100) | (2,900)
Core Portfolio | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 286,058 |
Fair value, liability derivatives | (15,104) | (6,332)
Core Portfolio | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 245,827 |
Fair value, asset derivatives | 3,129 | 6,022
Derivative financial instruments (Note 8) | $ 3,129 | 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 | 2.22% |
Core Portfolio | Interest Rate Swaps | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2013-02 |
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 | 2017-12 |
Derivative Maturity Date | 2026-06 |
Strike Rate | 3.77% |
Fund Portfolio | Fund II |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 42,564 |
Fair value, derivatives, net | 33 | 108
Fund Portfolio | Fund II | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 19,264 |
Derivative Effective Date | 2014-10 |
Derivative Maturity Date | 2021-11 |
Fair value, asset derivatives | $ 16 | 108
Derivative financial instruments (Note 8) | $ 16 | 108
Fund Portfolio | Fund II | Interest Rate Swaps | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.88% |
Fund Portfolio | Fund II | Interest Rate Swaps | Maximum | Other Assets |  |
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 | $ 17 | 0
Derivative financial instruments (Note 8) | $ 17 | 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 | $ 182,748 |
Fair value, derivatives, net | 329 | 859
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | $ 2,246 |
Derivative Effective Date | 2019-01 |
Derivative Maturity Date | 2022-04 |
Fair value, liability derivatives | $ (37) | 0
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 71,602 |
Fair value, asset derivatives | 366 | 851
Derivative financial instruments (Note 8) | $ 366 | 851
Fund Portfolio | Fund IV | Interest Rate Swaps | Minimum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.61% |
Fund Portfolio | Fund IV | Interest Rate Swaps | Minimum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2017-03 |
Derivative Maturity Date | 2020-03 |
Strike Rate | 1.82% |
Fund Portfolio | Fund IV | Interest Rate Swaps | Maximum | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Strike Rate | 2.61% |
Fund Portfolio | Fund IV | Interest Rate Swaps | Maximum | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Effective Date | 2017-11 |
Derivative Maturity Date | 2022-12 |
Strike Rate | 2.11% |
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
Derivative financial instruments (Note 8) | $ 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
Derivative financial instruments (Note 8) | $ 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 | (2,233) | (951)
Fund Portfolio | Fund V | Interest Rate Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 0 |
Fair value, asset derivatives | 0 | 21
Derivative financial instruments (Note 8) | 0 | 21
Fund Portfolio | Fund V | Interest Rate Swaps | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Aggregate Notional Amount | 156,900 |
Fair value, liability derivatives | $ (2,233) | $ (972)
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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