Annual report pursuant to Section 13 and 15(d)

Nature Of Operations And Accounting Policies (Schedule Of Intangible Assets) (Details)

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Nature Of Operations And Accounting Policies (Schedule Of Intangible Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]      
Intangible assets, beginning balance $ 37,047 $ 37,047  
Acquired intangible assets 0 1,120  
Fully amortized intangible assets   (1,120)  
Intangible assets, ending balance 37,047 37,047 $ 37,047
Changes in Accumulated Amortization [Roll Forward]      
Accumulated amortization, beginning balance (12,496) (8,941)  
Amortization expense (3,555) (4,675) (2,900)
Fully amortized intangible assets   1,120  
Accumulated amortization, ending balance $ (16,051) (12,496) (8,941)
Weighted average remaining contractual life, in years 6 years 10 months 24 days    
Trademark/ Tradenames      
Finite-lived Intangible Assets [Roll Forward]      
Intangible assets, beginning balance $ 3,324 3,324  
Acquired intangible assets 0 0  
Fully amortized intangible assets   0  
Intangible assets, ending balance 3,324 3,324 3,324
Changes in Accumulated Amortization [Roll Forward]      
Accumulated amortization, beginning balance (2,312) (1,980)  
Amortization expense (332) (332)  
Fully amortized intangible assets   0  
Accumulated amortization, ending balance $ (2,644) (2,312) (1,980)
Weighted average remaining contractual life, in years 2 years    
Customer Relationships      
Finite-lived Intangible Assets [Roll Forward]      
Intangible assets, beginning balance $ 15,365 15,365  
Acquired intangible assets 0 1,120  
Fully amortized intangible assets   (1,120)  
Intangible assets, ending balance 15,365 15,365 15,365
Changes in Accumulated Amortization [Roll Forward]      
Accumulated amortization, beginning balance (6,428) (5,146)  
Amortization expense (1,282) (2,402)  
Fully amortized intangible assets   1,120  
Accumulated amortization, ending balance $ (7,710) (6,428) (5,146)
Weighted average remaining contractual life, in years 7 years 1 month 6 days    
Acquired Contractual Rights      
Finite-lived Intangible Assets [Roll Forward]      
Intangible assets, beginning balance $ 18,358 18,358  
Acquired intangible assets 0 0  
Fully amortized intangible assets   0  
Intangible assets, ending balance 18,358 18,358 18,358
Changes in Accumulated Amortization [Roll Forward]      
Accumulated amortization, beginning balance (3,756) (1,815)  
Amortization expense (1,941) (1,941)  
Fully amortized intangible assets   0  
Accumulated amortization, ending balance $ (5,697) $ (3,756) $ (1,815)
Weighted average remaining contractual life, in years 7 years 1 month 6 days