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Revenues Revenues:Effect of change related to ASU 2014-09 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Balance Sheet [Abstract]
Retained earnings	$ 356,698	$ 330,056
Income Statement [Abstract]
Sales	$ 4,643,404	4,995,290	$ 4,431,991
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Balance Sheet [Abstract]
Retained earnings				$ 0
Income Statement [Abstract]
Sales		$ 26,500

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