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Significant Transactions - Summary of Wholly-owned Investment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Combinations [Abstract]
Operating revenues	$ 8,483	$ 13,966	$ 5,463
Loss from operations before income taxes	$ (2,039)	$ (4,313)	$ (2,755)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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