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Other Derivatives - Hedging instruments on statements of operations (Details) - Nonoperating Income (Expense) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Interest Rate Products |  |  |  |
Derivatives not designated as cash flow hedging instruments under Subtopic 815-20 |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ (118) |  | $ (286) |
Other Contracts |  |  |  |
Derivatives not designated as cash flow hedging instruments under Subtopic 815-20 |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 2 | $ (29) | (64) | $ (42)
Not Designated as Hedging Instrument |  |  |  |
Derivatives not designated as cash flow hedging instruments under Subtopic 815-20 |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ (116) | $ (29) | $ (350) | $ (42)

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