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Discontinued operations (Tables)
 3 Months Ended
Mar. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]  
Disposal groups, including discontinued operations
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 were as follows:
 
March 31, 2016

March 31, 2015

December 31, 2015

 
(In thousands)
Assets
 
 
 
Current assets:
 
 
 
Receivables, net
$
3,619

$
58,125

$
13,387

Inventories
1,308

8,526

1,308

Commodity derivative instruments
—

7,127

—

Income taxes receivable
50,478

12,666

9,665

Prepayments and other current assets
2,348

4,761

221

Total current assets held for sale
57,753

91,205

24,581

Noncurrent assets:
 
 
 
Investments
37

37

37

Net property, plant and equipment
9,363

1,110,592

793,422

Deferred income taxes
86,614

—

127,655

Other
161

2,900

161

Less allowance for impairment of assets held for sale
(1,374
)
—

754,541

Total noncurrent assets held for sale
97,549

1,113,529

166,734

Total assets held for sale
$
155,302

$
1,204,734

$
191,315

Liabilities
 
 
 
Current liabilities:
 
 
 
Long-term debt due within one year
$
—

$
754

$
—

Accounts payable
7,963

54,623

25,013

Taxes payable
35

4,125

1,052

Deferred income taxes
3,620

4,398

3,620

Accrued compensation
761

2,891

13,080

Other accrued liabilities
4,791

15,522

4,838

Total current liabilities held for sale
17,170

82,313

47,603

Noncurrent liabilities:
 
 
 
Deferred income taxes
—

69,456

—

Asset retirement obligations
—

53,202

—

Other liabilities
—

192

—

Total noncurrent liabilities held for sale
—

122,850

—

Total liabilities held for sale
$
17,170

$
205,163

$
47,603
Reconciliation of major classes of income and expense
The reconciliation of the major classes of income and expense constituting pretax loss from discontinued operations to the after-tax net loss from discontinued operations on the Company's Consolidated Statements of Income were as follows:
 
Three Months Ended
 
March 31,
 
2016

2015

 
(In thousands)
Operating revenues
$
2,910

$
54,936

Operating expenses
4,470

572,952

Operating loss
(1,560
)
(518,016
)
Other income
6

1,881

Interest expense
13

21

Loss from discontinued operations before income taxes
(1,567
)
(516,156
)
Income taxes
(732
)
(191,551
)
Loss from discontinued operations
$
(835
)
$
(324,605
)