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Condensed Consolidated Statement of Operations (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
General and administrative expenses, equity-based compensation $ 1,938 $ 821 $ 3,606 $ 1,939
Unrealized gains (losses) on derivative instruments $ 13,408 $ (3,197) $ 12,026 $ (6,241)