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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
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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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- 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 + Details
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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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