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Derivatives and Hedging Activities - Schedule of Interest Rate Derivatives (Details) - Designated as Hedging Instrument - Cash Flow Hedging - Swap $ in Thousands	Sep. 30, 2018 USD ($) derivative	Dec. 31, 2017 USD ($) derivative
Derivative [Line Items]
Number of Instruments (derivative) | derivative	64	35
Notional Amount | $	$ 604,977	$ 673,345
GBP
Derivative [Line Items]
Number of Instruments (derivative) | derivative	48	19
Notional Amount | $	$ 239,740	$ 301,155
EUR
Derivative [Line Items]
Number of Instruments (derivative) | derivative	13	13
Notional Amount | $	$ 215,237	$ 222,190
USD
Derivative [Line Items]
Number of Instruments (derivative) | derivative	3	3
Notional Amount | $	$ 150,000	$ 150,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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-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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