Discontinued operations (Tables)

12 Months Ended

Dec. 31, 2015

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The carrying amounts of the major classes of assets and liabilities that are classified as held for sale on the Company's Consolidated Balance Sheets at December 31 were as follows:

	2015		2014
	(In thousands)
Assets
Current assets:
Receivables, net	$	13,387	$	94,132
Inventories	1,308		11,401
Commodity derivative instruments	—		18,335
Prepayments and other current assets	9,886		7,309
Total current assets held for sale	24,581		131,177
Noncurrent assets:
Investments	37		37
Net property, plant and equipment	793,422		1,618,099
Deferred income taxes	127,655		—
Other	161		2,334
Less allowance for impairment of assets held for sale	754,541		—
Total noncurrent assets held for sale	166,734		1,620,470
Total assets held for sale	$	191,315	$	1,751,647
Liabilities
Current liabilities:
Long-term debt due within one year	$	—	$	897
Accounts payable	25,013		103,556
Taxes payable	1,052		19,900
Deferred income taxes	3,620		8,206
Accrued compensation	13,080		5,373
Other accrued liabilities	4,838		16,796
Total current liabilities held for sale	47,603		154,728
Noncurrent liabilities:
Deferred income taxes	—		238,391
Other liabilities	—		57,050
Total noncurrent liabilities held for sale	—		295,441
Total liabilities held for sale	$	47,603	$	450,169

Reconciliation of Major Classes of Income And Expense [Table Text Block]

The reconciliation of the major classes of income and expense constituting pretax income (loss) from discontinued operations to the after-tax net income (loss) from discontinued operations of the Company's Consolidated Statements of Income at December 31 were as follows:

	2015			2014		2013
	(In thousands)
Operating revenues	$	184,853		$	547,571	$	536,023
Operating expenses	1,423,037			378,891		364,120
Operating income (loss)	(1,238,184		)	168,680		171,903
Other income	2,374			1,163		549
Interest expense	235			110		114
Income (loss) from discontinued operations before income taxes	(1,236,045		)	169,733		172,338
Income taxes	(463,660		)	54,558		62,459
Income (loss) from discontinued operations	$	(772,385	)	$	115,175	$	109,879