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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes									$ (857)	$ (3,142)	$ (60)
Diluted loss per share from discontinued operation (in US dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ (0.03)	$ (0.01)	$ (0.02)	$ 0.00	$ (0.01)	$ (0.05)	$ 0.00
Restructuring reserve	$ 492				$ 201				$ 492	$ 201	$ 81
United Kingdom Construction
Income Statement [Abstract]
Revenues									863	345	3,823
Loss from discontinued operation, net of income taxes									$ (857)	$ (3,142)	$ (60)
Diluted loss per share from discontinued operation (in US dollars per share)									$ (0.01)	$ (0.05)	$ 0.00
Restructuring reserve	100								$ 100
Assets of discontinued operation:
Current assets	242				1,233				242	$ 1,233
Liabilities of discontinued operation:
Current liabilities	$ 2,811				$ 4,036				$ 2,811	$ 4,036

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