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Revenues:Effect of change related to ASU 2014-09 (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 02, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Balance Sheet [Abstract] |  |  |  |  |
Retained earnings | $ 395,500,000 |  |  |  | $ 361,243,000
Receivables, trade | 339,299,000 |  | $ 247,952,000 |  | 246,452,000
Accrued liabilities, other | 63,780,000 |  | $ 57,286,000 |  | $ 55,786,000
Income Statement [Abstract] |  |  |  |  |
Sales | 1,182,841,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 1,009,778,000 | $ 846,759,000 |  |  |
Selling and distribution expenses | 83,356,000 | $ 73,679,000 |  |  |
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |
Balance Sheet [Abstract] |  |  |  |  |
Receivables, trade | 337,599,000 |  |  |  |
Accrued liabilities, other | 62,080,000 |  |  |  |
Income Statement [Abstract] |  |  |  |  |
Sales | 1,175,838,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 1,003,133,000 |  |  |  |
Selling and distribution expenses | 82,998,000 |  |  |  |
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 |  |  | 1,500,000 |
Accrued liabilities, other | 1,700,000 |  |  | $ 1,500,000 |
Income Statement [Abstract] |  |  |  |  |
Sales | 7,003,000 |  |  |  |
Materials, labor, and other operating expenses (excluding depreciation) | 6,645,000 |  |  |  |
Selling and distribution expenses | $ 358,000 |  |  |  |

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