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Schedule III - Supplemental Financial Information (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expenses (Benefits) Related to US Tax Cuts and Jobs Act | $ 6,200 |
Tubular and Pipe Products [Member] |  |
Inventory, LIFO Reserve, Effect on Income, Net | $ 2,707 | $ 1,489

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- Definition The difference between the change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods and any LIFO decrement which have been reflected in the statement of income during the period. + References No definition available. + Details
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- Definition The amount of income tax expenses (benefits) recorded during the period related to US tax cuts and jobs act. + References No definition available. + Details
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- Details
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