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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
General and administrative expenses, equity-based compensation $ 13,314 $ 7,090 $ 4,387
Unrealized gains (losses) on derivative instruments $ (11,523) $ 2,608 $ (1,063)