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Inventory (Schedule of Inventory) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials - current	$ 19,388	$ 26,152
Work-in-process	1,692	3,016
Finished goods	0	1,022
Inventory - current	21,080	30,190
Raw materials - long term (net of allowances of $24 and $19, respectively	1,068	3,980
Inventory	22,148	34,170
Allowance for inventory obsolescence	$ 24	$ 19	$ 15	$ 15

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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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