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Major classes of assets and liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
--- | --- | --- | ---
Current assets: |  |  |
Receivables, net | $ 33,551 | $ 94,132 | $ 146,589
Inventories | 6,748 | 11,401 | 12,849
Deferred income taxes | 0 | 0 | 6,623
Commodity derivative instruments | 2,537 | 18,335 | 129
Prepayments and other current assets | 34,456 | 7,309 | 6,328
Total current assets held for sale | 77,292 | 131,177 | 172,518
Noncurrent assets: |  |  |
Investments | 37 | 37 | 37
Net property, plant and equipment | 1,097,576 | 1,618,099 | 1,753,509
Deferred income taxes | 52,017 | 0 | 0
Other | 161 | 2,334 | 4,091
Less allowance for impairment of assets held for sale | 399,987 | 0 | 0
Total noncurrent assets held for sale | 749,804 | 1,620,470 | 1,757,637
Total assets held for sale | 827,096 | 1,751,647 | 1,930,155
Current liabilities: |  |  |
Long-term debt due within one year | 0 | 897 | 569
Accounts payable | 49,400 | 103,556 | 165,189
Taxes payable | 4,064 | 19,900 | 15,051
Deferred income taxes | 1,401 | 8,206 | 0
Accrued compensation | 4,460 | 5,373 | 5,721
Commodity derivative instruments | 3,511 | 0 | 17,449
Other accrued liabilities | 12,107 | 16,796 | 27,640
Total current liabilities held for sale | 74,943 | 154,728 | 231,619
Noncurrent liabilities: |  |  |
Long-term debt | 0 | 0 | 608
Deferred income taxes | 0 | 238,391 | 257,316
Other liabilities | 35,790 | 57,050 | 60,761
Total noncurrent liabilities held for sale | 35,790 | 295,441 | 318,685
Total liabilities held for sale | $ 110,733 | $ 450,169 | $ 550,304

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