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Derivatives and Hedging Activities - Summary of Currency Draws and Related Net Investments (Details) € in Thousands, £ in Thousands, $ in Thousands	Sep. 30, 2018 USD ($)	Jul. 01, 2018 EUR (€)	Jul. 01, 2018 GBP (£)	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Line of credit, amount drawn	$ 455,556			$ 298,909
Foreign currency derivative instruments, liability fair value	373,000	€ 349,881	£ 92,213
GBP
Derivative [Line Items]
Foreign currency derivative instruments, liability fair value	120,100
EUR
Derivative [Line Items]
Foreign currency derivative instruments, liability fair value	406,000
JPMorgan Chase Bank, N.A. | Revolving Credit Facility
Derivative [Line Items]
Line of credit, amount drawn		€ 276,500	£ 40,000
JPMorgan Chase Bank, N.A. | Revolving Credit Facility | GBP | Individual Investment
Derivative [Line Items]
Line of credit, amount drawn	52,100
JPMorgan Chase Bank, N.A. | Revolving Credit Facility | EUR | Individual Investment
Derivative [Line Items]
Line of credit, amount drawn	$ 320,800

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No definition available.

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Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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