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Assets Held for Sale (Assets and Liabilities Held for Sale) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets held for sale: |  |
Cash and equivalents |  | $ 192
Accounts receivable | $ 735 | 1,185
Other current assets | 59 | 219
Current assets held for sale | 794 | 1,596
Long-term assets held for sale: |  |
Property and equipment | 413 | 12,623
Goodwill | 332 | 2
Long-term assets held for sale | 745 | 12,625
Current liabilities held for sale: |  |
Accounts payable | 157 | 804
Accrued liabilities | 22 | 215
Deferred revenue | 749 | 1,136
Current liabilities held for sale | $ 928 | $ 2,155

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