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Disposition of Assets (Narrative) (Details) - USD ($)	3 Months Ended
Disposition of Assets (Narrative) (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes	$ 0	$ (282,000)
From discontinued operation (in US dollars per share)	$ 0	$ 0.00
UNITED KINGDOM \| Discontinued Operations [Member] \| United Kingdom Construction [Member]
Income Statement [Abstract]
Revenues	$ 0	$ 0
Loss from discontinued operation, net of income taxes	$ 0	$ (282,000)
From discontinued operation (in US dollars per share)	$ 0	$ 0.00
Current liabilities	$ 0		$ 3,700,000

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. 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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