Major classes of assets and liabilities held for sale E&P (Details 3) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Total current assets held for sale	$ 430	$ 479
Noncurrent assets:
Total noncurrent assets held for sale	2,087	4,392
Current liabilities:
Total current liabilities held for sale	4,001	11,993
Exploration and production [Member] | Discontinued operations, held-for-sale or disposed by sale [Member]
Current assets:
Receivables, net	430	479
Total current assets held for sale	430	479
Noncurrent assets:
Net property, plant and equipment	0	1,631
Deferred income taxes	1,926	2,637
Other	161	161
Total noncurrent assets held for sale	2,087	4,429
Total assets held for sale	2,517	4,908
Current liabilities:
Accounts payable	80	30
Taxes payable	1,451	10,857
Other accrued liabilities	2,470	2,884
Total current liabilities held for sale	4,001	13,771
Total liabilities held for sale	$ 4,001	$ 13,771