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Derivatives - Derivative Gain (Loss) Recognized in Income Statement (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Effect of derivative instruments on results of operations |  |  |  |
Interest expense | $ 25,954 | $ 23,337 | $ 49,571 | $ 45,884
Accumulated Other Comprehensive Income (Loss) | Reclassification adjustments |  |  |  |
Effect of derivative instruments on results of operations |  |  |  |
Interest expense | $ (791) | $ (207) | $ (1,717) | $ (153)

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