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Continued Dumping and Subsidy Act (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016
CDSOA [Abstract] |  |  |  |  |  |
Continued Dumping & Subsidy Offset Act (CDSOA) receipts, net of expense | $ 0 | $ (200,000) | $ 0 | $ 53,600,000 |  |
Continued Dumping and Subsidy Offset Act, distributions |  |  |  |  | $ 6,300,000 | $ 48,100,000

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- Definition CDSOA [Abstract] + References No definition available. + Details
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- Definition Receipt Of Continued Dumping And Subsidy Offset Act Payment Net Of Expenses + References No definition available. + Details
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- Definition Monies received from CDSOA + References No definition available. + Details
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