Intangible Assets - Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Intangible Assets
Gross carrying amount	$ 122,651	$ 118,203
Accumulated amortization	(112,220)	(106,930)
Net carrying amount	10,431	11,273
Customer relationships
Intangible Assets
Gross carrying amount	2,853	1,453
Accumulated amortization	(1,628)	(1,252)
Net carrying amount	1,225	201
Artist relationships
Intangible Assets
Gross carrying amount	12,235	11,916
Accumulated amortization	(10,659)	(10,337)
Net carrying amount	1,576	1,579
Media content
Intangible Assets
Gross carrying amount	91,445	91,616
Accumulated amortization	(90,187)	(87,604)
Net carrying amount	$ 1,258	4,012
Intangibles, useful life	5 years
Technology
Intangible Assets
Gross carrying amount	$ 6,204	5,654
Accumulated amortization	(4,751)	(3,649)
Net carrying amount	1,453	2,005
Non-compete agreements
Intangible Assets
Gross carrying amount	25	25
Accumulated amortization	(20)	(11)
Net carrying amount	5	14
Trade names
Intangible Assets
Gross carrying amount	9,889	7,539
Accumulated amortization	(4,975)	(4,077)
Net carrying amount	$ 4,914	$ 3,462
Weighted Average | Customer relationships
Intangible Assets
Intangibles, useful life	4 years 3 months 18 days	3 years 8 months 12 days
Weighted Average | Artist relationships
Intangible Assets
Intangibles, useful life	4 years 1 month 6 days	4 years 1 month 6 days
Weighted Average | Media content
Intangible Assets
Intangibles, useful life	5 years 1 month 6 days	5 years 1 month 6 days
Weighted Average | Technology
Intangible Assets
Intangibles, useful life	4 years 7 months 6 days	4 years 8 months 12 days
Weighted Average | Non-compete agreements
Intangible Assets
Intangibles, useful life	3 years	3 years
Weighted Average | Trade names
Intangible Assets
Intangibles, useful life	10 years 2 months 12 days	10 years 2 months 12 days