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Disposition of Assets (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes	$ (504)	$ (81)
From discontinued operation (in US dollars per share)	$ (0.01)	$ 0.00
Restructuring reserve	$ 236	$ 172	$ 201	$ 81
UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Revenues	0	63
Loss from discontinued operation, net of income taxes	$ (504)	$ (81)
From discontinued operation (in US dollars per share)	$ (0.01)	$ 0.00
Assets of discontinued operation:
Current assets	$ 935		1,233
Liabilities of discontinued operation:
Current liabilities	3,932		$ 4,036
Employee Severance [Member] | UNITED KINGDOM | Discontinued Operations [Member] | United Kingdom Construction [Member]
Income Statement [Abstract]
Restructuring reserve	$ 100

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