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Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Details) - Interest rate swaps - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative in liability position	$ (29,000)	$ 8,500
Variation margin	44,800	8,500
Derivative assets		1,800
Not Designated as Hedging Instrument, Trading
Derivative [Line Items]
Derivatives not designated as hedging instruments - assets	$ 15,878	$ 10,263

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- Definition

Derivative Instruments, Variation Margin Receivable

+ References

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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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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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