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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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