Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended			120 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2026
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 4,312	$ 4,956	$ 5,526
Gross Carrying Amount	35,776	34,182
Accumulated Amortization	20,656	16,344	11,390
Total amortization expense	15,120	17,838
Finite-lived Intangible Assets Acquired	133
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,912	16,888
Accumulated Amortization	8,347	6,431
Total amortization expense	9,565	10,457
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,385	4,122
Accumulated Amortization	1,450	1,180
Total amortization expense	2,935	2,942
Internally developed software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,324	2,301
Accumulated Amortization	2,206	1,904
Total amortization expense	118	397
Proprietary content
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,223	7,960
Accumulated Amortization	5,908	4,431
Total amortization expense	2,315	3,529
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,284	2,284
Accumulated Amortization	2,284	2,056
Total amortization expense	0	228
Off-Market Favorable Lease
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	648	627
Accumulated Amortization	461	342
Total amortization expense	187	285
Cost of service sales [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	1,477	2,068	1,978
General and Administrative Expense [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 2,835	$ 2,888	$ 3,548
Acquisition Prior to 2013 [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Headland Media Limited | Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Headland Media Limited | Distribution rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Headland Media Limited | Internally developed software
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Headland Media Limited | Proprietary Content [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Videotel | Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years
Videotel | Internally developed software
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Videotel | Off-Market Favorable Lease
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Videotel | Proprietary Content [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Q1 2017 Acquisition [Member] | Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Finite-lived Intangible Assets Acquired	$ 100
Business Combination, Contingent Consideration Arrangements, Description	$ 33
Scenario, Forecast [Member] | Maximum | Q1 2017 Acquisition [Member]
Finite-Lived Intangible Assets [Line Items]
Business Combination, Contingent Consideration Arrangements, Description				$ 114