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Summary of Significant Accounting Policies, Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventories [Abstract]
Raw materials	$ 91,610	$ 87,683
Finished goods	204,211	165,771
Inventories	295,821	253,454
Inventory Valuation Reserve [Member]
Valuation Allowance [Roll Forward]
Beginning balance	8,081	7,995	$ 20,744
Additions	23,940	16,382	24,906
Write-offs	(17,872)	(16,296)	(37,655)
Ending balance	$ 14,149	$ 8,081	$ 7,995

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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