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Derivatives and Hedging Activities - Disclosure of Credit Derivatives (Details) - Not Designated as Hedging Instrument - Swap $ in Thousands	Sep. 30, 2018 USD ($) derivative	Dec. 31, 2017 USD ($) derivative
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	93	58
Notional Amount | $	$ 229,001	$ 491,846
Foreign currency forwards | GBP
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	46	24
Notional Amount | $	$ 43,500	$ 32,116
Foreign currency forwards | EUR
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	41	22
Notional Amount | $	$ 42,428	$ 35,712
Interest rate swaps, net | EUR
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	5	6
Notional Amount | $	$ 140,573	$ 414,093
Put options | GBP
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	0	1
Notional Amount | $	$ 0	$ 675
Put options | EUR
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	1	5
Notional Amount | $	$ 2,500	$ 9,250

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[Line Items] for Schedule of Foreign Currency Swaps [Table]

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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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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
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-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

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