Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill and other intangible impairment charges		$ 51,848,000	$ 0	$ 1,680,000
Impairment of goodwill		48,933,000	0	0
Write-off of trademark		771,000	0	0
Amortization of intangible assets		3,000,000.0	$ 4,000,000.0	2,900,000
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment
Goodwill [Line Items]
Contract termination costs		510,000		0
Two Music Festivals | Discontinued Operations, Disposed of by Means Other than Sale, Abandonment
Goodwill [Line Items]
Impairment of goodwill	$ 4,100,000
Write-off of trademark	$ 800,000
Operating Segments
Goodwill [Line Items]
Impairment of goodwill		48,934,000
Operating Segments | Local Marketing Solutions
Goodwill [Line Items]
Goodwill and other intangible impairment charges		$ 2,915,000		$ 1,680,000