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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

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