Discontinued Operations (Assets And Liabilities of Disposal Groups) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]
Current assets	$ 158	$ 2,600
Property, plant and equipment, net of discontinued operations	27,000	92,634
Total assets	27,158	95,234
Current liabilities	$ 8,653	$ 4,661