Discontinued Operations (Assets and liabilities of disposal groups) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of Disposal Group, Including Discontinued Operation, Current	$ 66,713	$ 95,234
Segment, Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of Disposal Group, Including Discontinued Operation, Current	2,713	2,600
Property, plant and equipment, net, of discontinued operations	64,000	92,634
Disposal Group, Including Discontinued Operation, Assets, Total	66,713	95,234
Liabilities of Disposal Group, Including Discontinued Operation, Current	$ 3,495	$ 4,661