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Leases (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 13, 2021
Lessee, Lease, Description [Line Items]        
Operating lease fixed term       2 years
Weighted average remaining lease term 14 years      
Discount rate 3.70%      
Additional undiscounted commitments for leases not yet commenced $ 2,500,000      
Weighted average remaining finance lease term 2 years 10 months 24 days      
Finance discount rate 3.50%      
Future minimum sublease payments $ 69,000 $ 616,000  
Net book value $ 22,238,000 $ 25,649,000    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent Other Assets, Noncurrent    
Lease expenditure $ 27,978,000 $ 26,726,000 $ 26,968,000  
Minimum [Member]        
Lessee, Lease, Description [Line Items]        
Operating leases, remaining life 1 month      
Finance leases, remaining life 1 month      
Maximum [Member]        
Lessee, Lease, Description [Line Items]        
Operating leases, remaining life 18 years      
Finance leases, remaining life 6 years      
Computer Equipment [Member]        
Lessee, Lease, Description [Line Items]        
Net book value $ 6,192,000 8,280,000    
Yard And Other [Member]        
Lessee, Lease, Description [Line Items]        
Net book value $ 5,945,000 $ 7,601,000