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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2004
Dec. 31, 2002
Sep. 30, 2018
Dec. 31, 2017
Gross Operating Lease Commitments        
Gross Operating Lease Commitments     $ 1,531  
2019     5,447  
2020     4,070  
2021     3,195  
2022     2,365  
Thereafter     3,254  
Total     19,862  
Sublease Income        
2018 Remaining     (84)  
2019     (339)  
2020     (345)  
2021     (351)  
2022     (357)  
Thereafter     (271)  
Total     (1,747)  
Net Operating Lease Commitments        
2018 Remaining     1,447  
2019     5,108  
2020     3,725  
2021     2,844  
2022     2,008  
Thereafter     2,983  
Total     18,115  
Purchase Obligations        
2018 Remaining     190  
2019     95  
2020     12  
2021     0  
2022     0  
Thereafter     0  
Total     297  
Total Commitments        
Total commitments 2018 Remaining     1,637  
Total commitments in 2019     5,203  
Total commitments in 2020     3,737  
Total commitments in 2021     2,844  
Total commitments in 2022     2,008  
Total commitments Thereafter     2,983  
Total Commitments     18,412  
Local deals and getaway merchant payables     $ 8,000 $ 14,600
Travel Zoo Com Corporation        
Loss Contingencies        
Period for receiving shares under merger (in years) 2 years 2 years    
Number of shares exchanged under merger (in shares)   1