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Accumulated Other Comprehensive Loss (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance $ 13,078,000  
Ending balance 16,884,000  
Amounts reclassified from accumulated other comprehensive loss 0 $ 0
AOCI    
Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (3,597,000) (3,787,000)
Ending balance (3,780,000) (3,820,000)
Foreign Currency Translation    
Accumulated Other Comprehensive Income [Roll Forward]    
Other comprehensive income (loss) due to foreign currency translation, net of tax $ (183,000) $ (33,000)