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Disposition Of Assets (Components Of The Results Of Discontinued Operations For The UK Construction Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Loss from discontinued operation, net of income taxes									$ (60)	$ (4,690)	$ (23,069)
Diluted loss per share from discontinued operation (in US dollars per share)	$ 0.01	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.03)	$ 0.00	$ (0.07)	$ (0.34)
Restructuring reserve	$ 81				$ 281				$ 81	$ 281	$ 194
United Kingdom Construction
Income Statement [Abstract]
Revenues									3,823	19,297	83,631
Loss from discontinued operation, net of income taxes									$ (60)	$ (4,690)	$ (23,069)
Diluted loss per share from discontinued operation (in US dollars per share)									$ 0.00	$ (0.07)	$ (0.34)
Restructuring reserve	500								$ 500
Assets of discontinued operation:
Current assets	2,525				6,265				2,525	$ 6,265
Non-current assets	0				278				0	278
Liabilities of discontinued operation:
Current liabilities	4,407				10,743				4,407	10,743
Non-current liabilities	$ 0				$ 94				$ 0	$ 94

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