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Revenues:Effect of change related to ASU 2014-09 (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 02, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Balance Sheet [Abstract] |  |  |  |  |  |  |
Retained earnings | $ 434,534,000 |  | $ 434,534,000 |  |  |  | $ 361,243,000
Receivables, trade | 360,765,000 |  | 360,765,000 |  | $ 247,952,000 |  | 246,452,000
Accrued liabilities, other | 80,306,000 |  | 80,306,000 |  | $ 57,286,000 |  | $ 55,786,000
Income Statement [Abstract] |  |  |  |  |  |  |
Sales | 1,408,132,000 |  | 2,590,973,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 1,193,918,000 | $ 980,210,000 | 2,203,696,000 | $ 1,826,969,000 |  |  |
Selling and distribution expenses | 96,841,000 | $ 82,308,000 | 180,197,000 | $ 155,988,000 |  |  |
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |  |  |
Receivables, trade | 359,065,000 |  | 359,065,000 |  |  |  |
Accrued liabilities, other | 78,606,000 |  | 78,606,000 |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |
Sales | 1,401,152,000 |  | 2,576,990,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 1,187,376,000 |  | 2,190,509,000 |  |  |  |
Selling and distribution expenses | 96,403,000 |  | 179,401,000 |  |  |  |
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 | 6,980,000 |  | 13,983,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 6,542,000 |  | 13,187,000 |  |  |  |
Selling and distribution expenses | $ 438,000 |  | $ 796,000 |  |  |  |

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