Impairment of Assets Held for Sale (Valuation Allowance against Assets and Liabilities Held for Sale) (Details) - Disposal Groups [Member] $ in Thousands	Mar. 31, 2020 USD ($)
Assets:
Accounts receivable	$ 21,680
Inventories	15,313
Other current assets	704
Other assets	54
Total assets	37,751
Valuation, allowance	(13,810)
Total assets, net	23,941
Liabilities:
Accounts payable	7,866
Accrued liabilities	5,407
Other liabilities	1,001
Total liabilities	$ 14,274