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v3.19.1

Related Party Transactions (Details) - CHINA - Company's Joint Venture Partner - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Payments for advance to affiliate | $ 0 | $ 2,000,000 |
Payments for advance to affiliate by co-venturer | $ 0 | 500,000 |
Debt instrument, term | 1 year |  |
Debt instrument, interest rate, stated percentage | 3.00% |  |
Due from related parties | $ 6,100,000 |  | $ 6,000,000
Due to co-venturer from related party | $ 1,500,000 | $ 1,500,000 |

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