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Derivatives - Derivative Gain (Loss) Recognized in Income Statement (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Effect of derivative instruments on results of operations |  |
Interest expense | $ 23,617 | $ 22,547
Accumulated Other Comprehensive Income (Loss) | Reclassification adjustments |  |
Effect of derivative instruments on results of operations |  |
Interest expense | $ (926) | $ 54

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