Summary of Significant Accounting Policies, Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventories [Abstract]
Raw materials	$ 87,942	$ 91,610
Finished goods	187,949	204,211
Total Inventory, net	275,891	295,821
Inventory Valuation Reserve [Member]
Valuation Allowance [Roll Forward]
Beginning balance	14,149	8,081	$ 7,995
Additions	14,931	23,940	16,382
Write-offs	(16,785)	(17,872)	(16,296)
Ending balance	$ 12,295	$ 14,149	$ 8,081