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, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross, Beginning Balance $ 27,105 $ 31,690  
Acquired intangible assets 10,957 7,098  
Foreign currency translation 2 9  
Impairment of Intangible Assets, Finite-lived   (9,958)  
Finite-Lived Intangible Assets, Period Increase (Decrease) (1,017) (1,734)  
Intangible Assets, Gross, Ending Balance 37,047 27,105 $ 31,690
Accumulated Amortization, Beginning Balance 7,027 6,347  
Amortization expense 2,931 2,414 2,200
Fully amortized intangible assets, Accumulated Amortization 1,017 1,734  
Accumulated Amortization, Ending Balance $ 8,941 7,027 6,347
Weighted average remaining contractual life, in years 8 years 255 days    
Trademark/Tradenames      
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross, Beginning Balance $ 3,324 4,920  
Acquired intangible assets 0 0  
Foreign currency translation 0 0  
Impairment of Intangible Assets, Finite-lived   (1,596)  
Finite-Lived Intangible Assets, Period Increase (Decrease) 0 0  
Intangible Assets, Gross, Ending Balance 3,324 3,324 4,920
Accumulated Amortization, Beginning Balance 1,648 1,316  
Amortization expense 332 332  
Fully amortized intangible assets, Accumulated Amortization 0 0  
Accumulated Amortization, Ending Balance $ 1,980 1,648 1,316
Weighted average remaining contractual life, in years 4 years    
Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross, Beginning Balance $ 15,365 22,211  
Acquired intangible assets 0 1,598  
Foreign currency translation 0 0  
Impairment of Intangible Assets, Finite-lived   (7,142)  
Finite-Lived Intangible Assets, Period Increase (Decrease) 0 (1,302)  
Intangible Assets, Gross, Ending Balance 15,365 15,365 22,211
Accumulated Amortization, Beginning Balance 3,867 3,545  
Amortization expense 1,279 1,624  
Fully amortized intangible assets, Accumulated Amortization 0 1,302  
Accumulated Amortization, Ending Balance $ 5,146 3,867 3,545
Weighted average remaining contractual life, in years 8 years 292 days    
Software/Technology      
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross, Beginning Balance $ 0 1,652  
Acquired intangible assets 0 0  
Foreign currency translation 0 0  
Impairment of Intangible Assets, Finite-lived   (1,220)  
Finite-Lived Intangible Assets, Period Increase (Decrease) 0 (432)  
Intangible Assets, Gross, Ending Balance 0 0 1,652
Accumulated Amortization, Beginning Balance 0 288  
Amortization expense 0 144  
Fully amortized intangible assets, Accumulated Amortization 0 432  
Accumulated Amortization, Ending Balance $ 0 0 288
Weighted average remaining contractual life, in years 1 day    
Acquired Contractual Rights      
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross, Beginning Balance $ 8,416 2,907  
Acquired intangible assets 10,957 5,500  
Foreign currency translation 2 9  
Impairment of Intangible Assets, Finite-lived   0  
Finite-Lived Intangible Assets, Period Increase (Decrease) (1,017) 0  
Intangible Assets, Gross, Ending Balance 18,358 8,416 2,907
Accumulated Amortization, Beginning Balance 1,512 1,198  
Amortization expense 1,320 314  
Fully amortized intangible assets, Accumulated Amortization 1,017 0  
Accumulated Amortization, Ending Balance $ 1,815 $ 1,512 $ 1,198
Weighted average remaining contractual life, in years 9 years