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Equity Method Investments Summarized Financial Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]      
Current assets $ 12,671 $ 7,760  
Non-current assets 244,329 237,516  
Current liabilities 1,798 4,512  
Revenues 28,805 2,217 $ 0
Gross profit 28,805 2,217 0
Net Income/loss $ 10,714 $ (3,641) $ (1,967)