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Condensed Consolidated Statement of Operations (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement [Abstract] |  |  |  |
General and administrative expenses, equity-based compensation | $ 4,294 | $ 4,014 | $ 8,195 | $ 7,356
Unrealized gain (loss) on derivatives | $ 10,787 | $ 24,796 | $ (4,198) | $ 15,941

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