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Impairment of Assets Held for Sale (Valuation Allowance against Assets and Liabilities Held for Sale) (Details) - Renewable Power Systems [Member] $ in Thousands | Dec. 31, 2019 USD ($)
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Assets: |
Accounts receivable | $ 18,140
Inventories | 17,929
Other current assets | 363
Other assets | 142
Total assets | 36,574
Valuation, allowance | (14,438)
Total assets, net | 22,136
Liabilities: |
Accounts payable | 1,962
Accrued liabilities | 7,733
Other liabilities | 491
Total liabilities | $ 10,186

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