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Assets Held for Sale (Assets and Liabilities Held for Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets held for sale:
Cash and equivalents	$ 69	$ 42
Accounts receivable	1,709	5,726
Other current assets	243	571
Current assets held for sale	2,021	6,339
Long-term assets held for sale:
Property and equipment	12,617	33,624
Goodwill		244
Other assets	2	121
Long-term assets held for sale	12,619	33,989
Current liabilities held for sale:
Accounts payable	834	1,320
Accrued liabilities	314	1,811
Deferred revenue	1,107	252
Current liabilities held for sale	$ 2,255	$ 3,383

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