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Goodwill and Intagible Assets (Details 3) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) $ 11,637 $ 15,120
Finite-lived intangible assets, gross 35,394 35,776
Intangible assets, accumulated amortization 23,757 20,656
Finite-lived intangible assets, net 11,637 15,120
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 17,662 17,912
Intangible assets, accumulated amortization 9,858 8,347
Finite-lived intangible assets, net 7,804 9,565
Distribution rights    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 4,291 4,385
Intangible assets, accumulated amortization 1,663 1,450
Finite-lived intangible assets, net 2,628 2,935
Internally developed software    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 2,327 2,324
Intangible assets, accumulated amortization 2,327 2,206
Finite-lived intangible assets, net 0 118
Proprietary content    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 8,185 8,223
Intangible assets, accumulated amortization 7,070 5,908
Finite-lived intangible assets, net $ 1,115 2,315
Intellectual Property [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 7 years  
Finite-lived intangible assets, gross $ 2,284 2,284
Intangible assets, accumulated amortization 2,284 2,284
Finite-lived intangible assets, net 0 0
Off-Market Favorable Lease [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 645 648
Intangible assets, accumulated amortization 555 461
Finite-lived intangible assets, net $ 90 $ 187
Headland Media Limited [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Headland Media Limited [Member] | Distribution rights    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 15 years  
Headland Media Limited [Member] | Internally developed software    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 3 years  
Headland Media Limited [Member] | Proprietary content    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Videotel [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 8 years  
Videotel [Member] | Internally developed software    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 4 years  
Videotel [Member] | Proprietary content    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 5 years  
Videotel [Member] | Off-Market Favorable Lease [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 5 years