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Revenues Revenues:Effect of change related to ASU 2014-09 (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 02, 2018	Jan. 01, 2018
Balance Sheet [Abstract]
Retained earnings	$ 330,056,000	$ 361,243,000
Receivables, trade	214,338,000	246,452,000		$ 247,952,000
Accrued liabilities, other	63,509,000	55,786,000		$ 57,286,000
Income Statement [Abstract]
Sales	4,995,290,000
Materials, labor, and other operating expenses (excluding depreciation)	4,307,594,000	3,819,574,000	$ 3,396,075,000
Selling and distribution expenses	363,138,000	$ 327,220,000	$ 298,802,000
Accounting Standards Update 2014-09 [Member] \| Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Balance Sheet [Abstract]
Receivables, trade	212,638,000
Accrued liabilities, other	61,809,000
Income Statement [Abstract]
Sales	4,968,810,000
Materials, labor, and other operating expenses (excluding depreciation)	4,283,103,000
Selling and distribution expenses	361,149,000
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	26,480,000
Materials, labor, and other operating expenses (excluding depreciation)	24,491,000
Selling and distribution expenses	$ 1,989,000