Contingent Liabilities (Details Narrative) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2017	Jun. 30, 2016
Contingent Liabilities Details Narrative
Cap on environment financial responsibility	$ 1,871			$ 1,871
Environmental remediation expense	0	$ 2,000		0	$ 2,000
Total cost of remediation	$ 1,900			$ 1,900
Environmental remediation recovery			$ 3,000