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Accounts Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Receivables [Abstract] |  |
Trade and other accounts receivable | $ 214,045 | $ 211,244
Bank promissory notes | 14,680 | 19,269
Allowance for doubtful accounts | (8,141) | (7,337)
Accounts receivable, net | 220,584 | 223,176
Noncurrent receivables | $ 45,651 | $ 45,061
Interest rate | 2.00% |

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