Discontinued Operations (Assets and liabilities of disposal groups) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	$ 27,411	$ 27,158
Segment, Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	411	158
Property, plant and equipment, net	27,000	27,000
Total assets	27,411	27,158
Current liabilities	$ 7,401	$ 8,653