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Disposition of Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes	$ (282)	$ (504)
From discontinued operation (in US dollars per share)	$ 0.00	$ (0.01)
Restructuring reserve	$ 315	$ 236	$ 492	$ 201
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Revenues	0	0
Loss from discontinued operation, net of income taxes	$ (282)	$ (504)
From discontinued operation (in US dollars per share)	$ 0.00	$ (0.01)
Assets of discontinued operation:
Current assets	$ 151		242
Liabilities of discontinued operation:
Current liabilities	2,672		$ 2,811
Employee Severance [Member] | UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Restructuring reserve	$ 100

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