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Derivative Instruments and Hedging Activities - Hedge of Net Investment (Details) - Euro Notes - Net Investment Hedges - Designated as Hedging Instrument € in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2018 EUR (€)
Derivative [Line Items]
Hedged notes | €					€ 279,821	€ 209,276
Foreign exchange gains (losses)	$ 13,101	$ 2,139	$ 14,962	$ 6,761
Cumulative net gains			$ 29,220

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- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
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Amount, before tax, of increase (decrease) in the cumulative translation adjustment from gain (loss) on foreign currency derivatives that are designated as, and are effective as, economic hedges of a net investment in a foreign entity.

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