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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
General and administrative expenses, equity-based compensation $ 7,090 $ 4,387 $ 1,576
Realized and unrealized gains (losses) on derivative instruments $ 2,608 $ (1,063) $ 4,070