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Goodwill and Intangible Assets Goodwill and Intangible Assets Assets subject to Amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 14,827 $ 14,794
Accumulated Amortization 9,630 9,133
Net Carrying Value 5,197 5,661
Subscriber relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 7,717 7,678
Accumulated Amortization 4,880 4,519
Net Carrying Value 2,837 3,159
Distribution rights    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4,227 4,233
Accumulated Amortization 1,867 1,731
Net Carrying Value 2,360 2,502
Internally developed software    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 446 446
Accumulated Amortization 446 446
Net Carrying Value 0 0
Proprietary content    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 153 153
Accumulated Amortization 153 153
Net Carrying Value 0 0
Intellectual property    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,284 2,284
Accumulated Amortization 2,284 2,284
Net Carrying Value $ 0 $ 0