Supplemental Balance Sheet Information - Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Supplemental Balance Sheet Data [Abstract]
Raw materials and supplies	$ 29,343	$ 30,265
Work-in-process	2,510	3,246
Finished products	15,205	13,596
Construction materials	9,379	16,862
Total	56,437	$ 63,969
Inventory write-down, obsolescence	$ 2,800

Supplemental Balance Sheet Data [Abstract]

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Carrying amount as of the balance sheet date of unprocessed goods that will be used in the course of a construction project which will become a part of the finished inventory.

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