Basis of Presentation & Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Advertising expense	$ 56,000,000	$ 58,200,000	$ 44,700,000
Prepaid advertising costs	4,500,000	0
Research and development costs incurred	11,900,000	14,000,000	16,700,000
Interest expense capitalized	$ 0	0	$ 400,000
RGIS, LLC [Member] | Affiliate [Member]
Property, Plant and Equipment [Line Items]
Percent Of Common Stock, Once Convertible Preferred Stock Are Converted	15.80%
Amount paid for services received	$ 400,000	500,000
Kronos Incorporated [Member] | Affiliate [Member]
Property, Plant and Equipment [Line Items]
Amount paid for services received	200,000	200,000
Optiv, Inc. [Member] | Affiliate [Member]
Property, Plant and Equipment [Line Items]
Amount paid for services received	$ 200,000	$ 200,000
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives	2 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives	5 years
Other Property, Plant and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives	2 years
Other Property, Plant and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives	10 years