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Revenues:Effect of change related to ASU 2014-09 (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 02, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Balance Sheet [Abstract] |  |  |  |  |  |  |
Retained earnings | $ 405,871,000 |  | $ 405,871,000 |  |  |  | $ 361,243,000
Receivables, trade | 312,659,000 |  | 312,659,000 |  | $ 247,952,000 |  | 246,452,000
Accrued liabilities, other | 77,953,000 |  | 77,953,000 |  | $ 57,286,000 |  | $ 55,786,000
Income Statement [Abstract] |  |  |  |  |  |  |
Sales | 1,338,512,000 |  | 3,929,485,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 1,163,020,000 | $ 1,045,742,000 | 3,366,716,000 | $ 2,872,711,000 |  |  |
Selling and distribution expenses | 93,395,000 | $ 87,520,000 | 273,592,000 | $ 243,509,000 |  |  |
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |
Receivables, trade | 310,959,000 |  | 310,959,000 |  |  |  |
Accrued liabilities, other | 76,253,000 |  | 76,253,000 |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |
Sales | 1,331,788,000 |  | 3,908,778,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 1,156,903,000 |  | 3,347,412,000 |  |  |  |
Selling and distribution expenses | 92,788,000 |  | 272,189,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ 0 |
Receivables, trade | 1,700,000 |  | 1,700,000 |  |  | 1,500,000 |
Accrued liabilities, other | 1,700,000 |  | 1,700,000 |  |  | $ 1,500,000 |
Income Statement [Abstract] |  |  |  |  |  |  |
Sales | 6,724,000 |  | 20,707,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 6,117,000 |  | 19,304,000 |  |  |  |
Selling and distribution expenses | $ 607,000 |  | $ 1,403,000 |  |  |  |

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