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Accounts Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Receivables [Abstract] |  |
Trade and other accounts receivable | $ 223,717 | $ 211,244
Bank promissory notes | 18,332 | 19,269
Allowance for doubtful accounts | (7,922) | (7,337)
Accounts receivable, net | 234,127 | 223,176
Noncurrent receivables | $ 45,354 | $ 45,061
Interest rate | 2.00% |

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