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Derivatives and Hedging Activities - Foreign Cross Currency Derivatives (Details) - Net Investment Hedging - Designated as Hedging Instrument $ in Thousands, £ in Millions	Sep. 30, 2018 USD ($) derivative	Dec. 31, 2017 USD ($) derivative	Jul. 24, 2017 GBP (£)
Derivative [Line Items]
Number of Instruments (derivative)	1	5
Notional Amount | $	$ 64,007	$ 121,603
EUR | Cross currency swaps
Derivative [Line Items]
Number of Instruments (derivative)	0	3
Notional Amount | $	$ 0	$ 43,222
EUR | Foreign currency forwards
Derivative [Line Items]
Number of Instruments (derivative)	0	1
Notional Amount | $	$ 0	$ 12,099
GBP | Cross currency swaps
Derivative [Line Items]
Number of Instruments (derivative)	1	1
Notional Amount	$ 64,007	$ 66,282	£ 49.1

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

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+ References

No definition available.

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- Definition

Number of foreign currency exchange rate derivatives 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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