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Disposition of Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes	$ (523)	$ (207)	$ (1,010)	$ (729)
From discontinued operation (in US dollars per share)	$ (0.01)	$ 0.00	$ (0.02)	$ (0.01)
Restructuring reserve	$ 209	$ 49	$ 209	$ 49	$ 492	$ 201
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Revenues	0	(81)	0	863
Loss from discontinued operation, net of income taxes	$ (523)	$ (207)	$ (1,010)	$ (729)
From discontinued operation (in US dollars per share)	$ (0.01)	$ 0.00	$ (0.02)	$ (0.01)
Assets of discontinued operation:
Current assets	$ 100		$ 100		242
Liabilities of discontinued operation:
Current liabilities	2,252		2,252		$ 2,811
Employee Severance [Member] | UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Restructuring reserve	$ 100		$ 100

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