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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 22, 2019
Goodwill and Intangible Assets [Line Items]        
Amortization of intangible assets $ 7,200,000 $ 8,300,000    
Impairment of indefinite-lived intangible asset 0 6,800,000    
Goodwill And Other Intangible Assets        
Goodwill and Intangible Assets [Line Items]        
Goodwill, gross 213,200,000 213,300,000 $ 213,000,000  
Goodwill, accumulated impairment loss 2,300,000 2,300,000    
Goodwill, net 210,920,000 211,013,000 210,665,000  
Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Goodwill and Intangible Assets [Line Items]        
Goodwill, gross 14,400,000 15,100,000 15,100,000  
Goodwill, accumulated impairment loss 4,500,000 4,500,000    
Goodwill, net 9,903,000 $ 10,598,000 $ 10,598,000  
TMR        
Goodwill and Intangible Assets [Line Items]        
Goodwill, net       $ 13,094,000
Finite-lived intangible assets       11,200,000
Indefinite-lived intangible assets $ 0     $ 6,800,000
Low        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 1 year 3 months 18 days      
High        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 12 years 2 months 12 days      
Weighted Average or Actual        
Goodwill and Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life 5 years 6 months