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Revenues (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | The effect of the changes made to our consolidated balance sheet as of January 1, 2018, for the adoption of the new revenue standard was as follows:
| Balance at December 31, 2017 |  | Adjustments Due to ASC 606 |  | Balance at January 1, 2018
| (thousands)
ASSETS |  |  |  |  |
Receivables, trade | $ | 246,452 |  |  | $ | 1,500 |  |  | $ | 247,952 |
LIABILITIES |  |  |  |  |
Accrued liabilities, other | 55,786 |  |  | 1,500 |  |  | 57,286 |
In accordance with the new revenue standard requirements, the disclosure of the impact of adoption on our consolidated statement of operations and balance sheet was as follows:
| Three months ended March 31, 2018
| As Reported |  | Balances Without Adoption of ASC 606 |  | Effect of Change Higher/(Lower)
| (thousands)
STATEMENT OF OPERATIONS |  |  |  |  |
Sales | 1,182,841 |  |  | $ | 1,175,838 |  |  | $ | 7,003 |
Materials, labor, and other operating expenses (excluding depreciation) | 1,009,778 |  |  | 1,003,133 |  |  | 6,645 |
Selling and distribution expenses | 83,356 |  |  | 82,998 |  |  | 358 |
| March 31, 2018
| As Reported |  | Balances Without Adoption of ASC 606 |  | Effect of Change Higher/(Lower)
| (thousands)
BALANCE SHEET |  |  |  |  |
Assets |  |  |  |  |
Receivables, trade | $ | 339,299 |  |  | $ | 337,599 |  |  | $ | 1,700 |
Liabilities |  |  |  |  |
Accrued liabilities, other | 63,780 |  |  | 62,080 |  |  | 1,700 |

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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