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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
General and administrative expenses, equity-based compensation $ 4,387 $ 1,576 $ 3,488
Realized and unrealized gains (losses) on derivative instruments $ (1,063) $ 4,070 $ 155