Quarterly report pursuant to Section 13 or 15(d)

EQUITY INVESMENTS (Equity Investment Income Statement Disclosure) (Details)

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EQUITY INVESMENTS (Equity Investment Income Statement Disclosure) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]        
Gross revenue $ 179,114 $ 566,404 $ 443,958 $ 1,067,537
Net (loss) income $ (4,072) $ 49,018 $ 20,684 $ 113,470