Goodwill and Related Intangible Assets (Narrative) (Details)		12 Months Ended
	Oct. 31, 2017 reporting_unit	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Accumulated impairment losses		$ 133,200,000	$ 133,200,000
Goodwill impairment		$ 0	$ 0
Number of reporting units tested | reporting_unit	10
Impairment of definite-lived intangibles				$ 300,000
Trademarks
Goodwill [Line Items]
Impairment of indefinite-lived intangibles				$ 1,200,000