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Derivative Instruments - Cash flow hedges (Details) - Cash Flow Hedging - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Effects of derivative instruments |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ 684 | $ (223) | $ (3,088) | $ (1,907)
Interest rate contracts |  |  |  |
Effects of derivative instruments |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ 684 | $ (223) | $ (3,088) | $ (1,907)

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