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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	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes									$ 0	$ (2,345)	$ (857)
Diluted loss per share from discontinued operation (in US dollars per share)	$ 0	$ 0	$ 0	$ 0	$ (0.02)	$ (0.01)	$ 0.00	$ 0.00	$ 0	$ (0.04)	$ (0.01)
United Kingdom Construction
Income Statement [Abstract]
Revenues										$ 0	$ 863
Loss from discontinued operation, net of income taxes										$ (2,345)	$ (857)
Diluted loss per share from discontinued operation (in US dollars per share)										$ (0.04)	$ (0.01)
Discontinued Operations [Member] | UNITED KINGDOM | United Kingdom Construction
Income Statement [Abstract]
Current liabilities	$ 0				$ 3,700				$ 0	$ 3,700

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

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