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Discontinued Operations and Assets Held for Sale (Major Categories of Assets and Liabilities Reflected as Held for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current liabilities |  |
Total current liabilities associated with assets held for sale | $ 12,607 | $ 13,298
Discontinued Operations, Held-for-sale or Disposed of by Sale |  |
Current assets |  |
Cash | 34,894 | 25,185
Accounts receivable | 514 | 4,834
Inventories | 406 | 406
Prepaid expenses and other | 845 | 1,882
Property, Plant, and Equipment, net | 42,348 | 82,116
Deferred income taxes and other assets | 9,441 | 9,441
Total current assets associated with assets held for sale | 88,448 | 123,864
Current liabilities |  |
Accounts payable | 3,076 | 3,702
Current maturities of long-term debt (finance lease) | 709 | 705
Taxes payable | 1,510 | 1,411
Long-term debt (finance lease) | 7,067 | 7,240
Asset retirement obligation | 245 | 240
Total current liabilities associated with assets held for sale | $ 12,607 | $ 13,298

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