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Equity Method Investments Summarized Financial Information (Details) - Joint Ventures - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | $ 15,450 | $ 12,671 |
Non-current assets | 240,852 | 244,329 |
Current liabilities | 4,362 | 1,798 |
Revenues | 35,050 | 28,805 | $ 2,217
Gross profit | 17,690 | 13,344 | (2,048)
Net Income/loss | $ 15,701 | $ 10,714 | $ (3,641)

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