Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule Of Intangible Assets

	Estimated	December 31, 2019						December 31, 2018
	Useful Life			Accumulated						Accumulated
	(in years)	Gross		Amortization		Net		Gross		Amortization		Net
Patents and trademarks	10	$	36,880		15,382	$	21,498	$	36,880	$	12,134	$	24,746
Patents and trademarks pending	—		2,143		—		2,143		2,143		—		2,143
Trade names	15		29,398		5,530		23,868		29,398		3,132		26,266
Total intangible assets		$	68,421	$	20,912	$	47,509	$	68,421	$	15,266	$	53,155