Goodwill And Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, impairment loss		$ 3,961,000	$ 2,413,000
Amortization expense of intangible assets included in selling general and administrative expenses	700,000	800,000	900,000
Intangible asset impairment	0	1,900,000
Estimated future minimum rental payments		153,963,000
Goodwill	$ 37,248,000	$ 37,248,000	$ 39,482,000	$ 6,731,000
Maximum [Member]
Goodwill [Line Items]
Computing discounted cash flows, in years	10 years
Minimum [Member]
Goodwill [Line Items]
Computing discounted cash flows, in years	5 years
Trademarks [Member]
Goodwill [Line Items]
Intangible assets useful life, in years	20 years
Customer Relationships [Member]
Goodwill [Line Items]
Intangible assets useful life, in years	12 years
Lease Premium [Member] | Maximum [Member]
Goodwill [Line Items]
Intangible assets useful life, in years	9 years
Lease Premium [Member] | Minimum [Member]
Goodwill [Line Items]
Intangible assets useful life, in years	5 years
Area Development And Franchise Agreements [Member] | Maximum [Member]
Goodwill [Line Items]
Intangible assets useful life, in years	10 years
Area Development And Franchise Agreements [Member] | Minimum [Member]
Goodwill [Line Items]
Intangible assets useful life, in years	7 years