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Segment Reporting - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Operating income (loss)	$ 1,172	$ 470	$ 6,246	$ (2,761)
Other income, net	138	1,083	3,076	3,103
Income (loss) from continuing operations before income taxes	$ 1,310	$ 1,553	$ 9,322	$ 342

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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The net result for the period of deducting operating expenses from operating revenues.

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