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Condensed Consolidated Statement of Operations (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
General and administrative expenses, equity-based compensation $ 3,461 $ 1,938 $ 7,252 $ 3,606
Unrealized gains (losses) on derivative instruments $ (7,435) $ 13,408 $ (10,324) $ 12,026