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Disposition of Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes	$ (205)	$ (18)	$ (487)	$ (522)
From discontinued operation (in US dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ (0.01)
Restructuring reserve	$ 412	$ 172	$ 412	$ 172	$ 492	$ 201
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Revenues	0	944	0	944
Loss from discontinued operation, net of income taxes	$ (205)	$ (18)	$ (487)	$ (522)
From discontinued operation (in US dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ (0.01)
Assets of discontinued operation:
Current assets	$ 110		$ 110		242
Liabilities of discontinued operation:
Current liabilities	2,038		2,038		$ 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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