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Disposition Of Assets (Components Of The Results Of Discontinued Operations For The UK Construction Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes	$ 0	$ 0	$ (2,345)
Diluted loss per share from discontinued operation (in US dollars per share)	$ 0	$ 0	$ (0.04)
United Kingdom Construction
Income Statement [Abstract]
Revenues			$ 0
Loss from discontinued operation, net of income taxes			$ (2,345)
Diluted loss per share from discontinued operation (in US dollars per share)			$ (0.04)

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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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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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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