Major classes of assets and liabilities held for sale E&P (Details 3) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Current assets:
Total current assets held for sale	$ 458	$ 479	$ 7,290
Noncurrent assets:
Total noncurrent assets held for sale	4,392	4,392	95,719
Current liabilities:
Total current liabilities held for sale	11,726	11,993	2,394
Exploration and production | Discontinued operations, held-for-sale or disposed of by sale
Current assets:
Receivables, net	458	479	266
Total current assets held for sale	458	479	266
Noncurrent assets:
Net property, plant and equipment	1,631	1,631	4,515
Deferred income taxes	2,637	2,637	91,098
Other	161	161	161
Total noncurrent assets held for sale	4,429	4,429	95,774
Total assets held for sale	4,887	4,908	96,040
Current liabilities:
Accounts payable	0	30	67
Taxes payable	10,774	10,857	4,732	[1]
Other accrued liabilities	2,810	2,884	2,311
Total current liabilities held for sale	13,584	13,771	7,110
Total liabilities held for sale	$ 13,584	$ 13,771	$ 7,110

[1] On the Company's Consolidated Balance Sheets, this amount was reclassified to prepayments and other current assets and is reflected in current assets held for sale.