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Derivative Instruments and Hedging Activities - Forward Currency Contracts (Details) - Foreign Exchange Currency Forward Contracts € in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Derivative [Line Items]
Losses on derivatives	$ 0	$ 616,000	$ 737,000	$ 4,172,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	$ 0		$ 0
Not Designated as Hedging Instrument | Purchase
Derivative [Line Items]
Notional amount | €						€ 29,000
Not Designated as Hedging Instrument | Sell
Derivative [Line Items]
Notional amount					$ 33,374,000
Not Designated as Hedging Instrument | Prepaid expenses and other
Derivative [Line Items]
Derivative asset					$ 93,000

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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