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Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Parenthetical) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) derivative	Dec. 31, 2018 USD ($)
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	$ (53,194)	$ (7,304)
Core Portfolio
Derivatives, Fair Value [Line Items]
Derivative, notional amount	587,261
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 156,000
Interest Rate Swaps | Core Portfolio
Derivatives, Fair Value [Line Items]
Number of derivative instruments held | derivative	2
Fair value, liability derivatives	$ (15,700)	(2,900)
Derivative Effective Date	2020-07
Derivative, notional amount	$ 155,400	0
Interest Rate Swaps | Core Portfolio | Other Assets
Derivatives, Fair Value [Line Items]
Derivative, notional amount	163,500
Interest Rate Swaps | Core Portfolio | Other Liabilities
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	(46,395)	$ (6,332)
Derivative, notional amount	$ 423,761
Interest Rate Swaps | Fund Portfolio | Other Assets
Derivatives, Fair Value [Line Items]
Number of derivative instruments held | derivative	3
Fair value, liability derivatives	$ 600
Derivative Effective Date	2019-11
Interest Rate Swaps | Fund Portfolio | Other Liabilities
Derivatives, Fair Value [Line Items]
Number of derivative instruments held | derivative	2
Fair value, liability derivatives	$ (100)
Derivative Effective Date	2019-10

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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-Topic 210
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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

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The number of derivative instruments of a particular group held by the entity.

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