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Related Party Transactions (Details) - NSP China - Subsidiaries - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |
Notes receivable, related parties, current | $ 6,000,000.0 |  | $ 6,000,000.0
Company's Joint Venture Partner |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, rate | 3.00% |  |
Notes receivable, related parties, current | $ 1,500,000 |  | $ 1,500,000
Notes Receivable |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, amount | $ 0 | $ 0 |

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