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Disposition of Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes	$ (18)	$ (1,097)	$ (522)	$ (1,178)
From discontinued operation (in US dollars per share)	$ 0.00	$ (0.02)	$ (0.01)	$ (0.02)
Restructuring reserve	$ 172	$ 327	$ 172	$ 327	$ 201	$ 81
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Revenues	944	5	944	68
Loss from discontinued operation, net of income taxes	$ (18)	$ (1,097)	$ (522)	$ (1,178)
From discontinued operation (in US dollars per share)	$ 0.00	$ (0.02)	$ (0.01)	$ (0.02)
Assets of discontinued operation:
Current assets	$ 865		$ 865		1,233
Liabilities of discontinued operation:
Current liabilities	3,657		3,657		$ 4,036
Employee Severance [Member] | UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Restructuring reserve	$ 100		$ 100

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