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Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	$ (39,061)	$ (7,304)
Fair value, asset derivatives	2,583	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	562,560
Fair value, derivatives, net	$ (33,294)	(310)
Core Portfolio | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2020-07
Fair value, liability derivatives	$ (11,800)	(2,900)
Core Portfolio | Interest Rate Swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	423,442
Fair value, liability derivatives	(33,750)	(6,332)
Core Portfolio | Interest Rate Swaps | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	139,118
Fair value, asset derivatives	$ 456	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	2015-11
Derivative Maturity Date	2020-07
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	1.31%
Fund Portfolio | Fund II
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 42,373
Fair value, derivatives, net	(138)	108
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 19,073
Derivative Effective Date	2014-10
Derivative Maturity Date	2021-11
Fair value, liability derivatives	$ (139)	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	$ 1	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 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 IV
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 193,299
Fair value, derivatives, net	(790)	859
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	88,304
Fair value, liability derivatives	(812)	0
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 14,395
Derivative Effective Date	2019-12
Fair value, asset derivatives	$ 22	851
Fund Portfolio | Fund IV | Interest Rate Swaps | Minimum | Other Liabilities
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 | Minimum | Other Assets
Derivatives, Fair Value [Line Items]
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	2019-05
Derivative Maturity Date	2022-12
Strike Rate	4.00%
Fund Portfolio | Fund IV | Interest Rate Swaps | Maximum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Maturity Date	2022-12
Strike Rate	1.52%
Fund Portfolio | Fund IV | Interest Rate Cap | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 90,600
Fair value, asset derivatives	$ 0	8
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 V
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$ 334,626
Fair value, derivatives, net	(2,256)	(951)
Fund Portfolio | Fund V | Interest Rate Swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	156,900
Fair value, liability derivatives	(4,360)	(972)
Fund Portfolio | Fund V | Interest Rate Swaps | Other Assets
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	177,726
Fair value, asset derivatives	$ 2,104	$ 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 | Minimum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2019-10
Derivative Maturity Date	2022-10
Strike Rate	1.25%
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%
Fund Portfolio | Fund V | Interest Rate Swaps | Maximum | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Effective Date	2019-11
Derivative Maturity Date	2024-10
Strike Rate	1.47%

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