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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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