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Condensed Consolidated Statement of Operations (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
General and administrative expenses, equity-based compensation $ 1,668 $ 1,117
Unrealized gains (losses) on derivative instruments $ (1,380) $ (3,044)