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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