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Related Party Transactions (Details) - NSP China - Subsidiaries - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Notes receivable, related parties, current | $ 6,200,000 |  | $ 6,200,000 |  | $ 6,000,000
Company's Joint Venture Partner |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Notes receivable, related parties, current | 1,500,000 |  | 1,500,000 |  | $ 1,500,000
Notes Receivable |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, amount | 0 | $ 0 | $ 0 | $ 2,000,000 |
Related party transaction, rate |  |  | 3.00% |  |
Notes Receivable | Company's Joint Venture Partner |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, amount | $ 0 | $ 0 | $ 0 | $ 500,000 |

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