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Derivatives - Effect of Derivative Instruments on Balance Sheet (Details) - Derivatives designated as hedging instruments - Interest rate swaps - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Asset |  |
Derivative assets | $ 336 | $ 7,307
Derivative liability | (1,574) | 0
Other current assets |  |
Fair Value Asset |  |
Derivative assets | 336 | 3,185
Other assets |  |
Fair Value Asset |  |
Derivative assets | $ 0 | $ 4,122

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