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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property And Equipment [Member]    
Deferred tax liabilities $ (2,606) $ (2,786)
US Federal And State [Member]    
Deferred tax assets 914 929
Net deferred tax assets 914 929
Net deferred tax liabilities (140) (143)
Long-term deferred tax asset 774 786
US Federal And State [Member] | Prepaid Expenses [Member]    
Deferred tax liabilities (140) (143)
US Federal And State [Member] | Amortization Of Goodwill For Tax [Member]    
Deferred tax assets 140 175
US Federal And State [Member] | Amortization Of Startup Costs [Member]    
Deferred tax assets 70 98
US Federal And State [Member] | Property And Equipment [Member]    
Deferred tax assets 471 433
US Federal And State [Member] | NOL Carryforward [Member]    
Deferred tax assets 45 51
US Federal And State [Member] | Accrued Liabilities And Other [Member]    
Deferred tax assets 188 172
Foreign [Member]    
Deferred tax assets 5,280 5,576
Net deferred tax assets 5,280 5,576
Net deferred tax liabilities (4,509) (4,840)
Long-term deferred tax asset 771 736
Foreign [Member] | Property And Equipment [Member]    
Deferred tax assets 977 675
Foreign [Member] | NOL Carryforward [Member]    
Deferred tax assets 2,247 2,745
Foreign [Member] | Accrued Liabilities And Other [Member]    
Deferred tax assets 864 1,046
Foreign [Member] | Contingent Liability [Member]    
Deferred tax assets 157 348
Foreign [Member] | Exchange Rate Gain (Loss) [Member]    
Deferred tax assets 1,035 762
Net deferred tax liabilities (55) (95)
Foreign [Member] | Intangibles [Member]    
Net deferred tax liabilities (1,211) (1,317)
Foreign [Member] | Others [Member]    
Net deferred tax liabilities $ (637) $ (642)