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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes									$ (3,142)	$ (60)	$ (4,690)
Diluted loss per share from discontinued operation (in US dollars per share)	$ (0.03)	$ (0.01)	$ (0.02)	$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ 0.00	$ (0.05)	$ 0.00	$ (0.07)
Restructuring reserve	$ 201				$ 81				$ 201	$ 81	$ 281
United Kingdom Construction
Income Statement [Abstract]
Revenues									345	3,823	19,297
Loss from discontinued operation, net of income taxes									$ (3,142)	$ (60)	$ (4,690)
Diluted loss per share from discontinued operation (in US dollars per share)									$ (0.05)	$ 0.00	$ (0.07)
Restructuring reserve	100								$ 100
Assets of discontinued operation:
Current assets	1,233				2,525				1,233	$ 2,525
Liabilities of discontinued operation:
Current liabilities	$ 4,036				$ 4,407				$ 4,036	$ 4,407

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