Revenues - Summary of Revenue Disaggregated by Sales Channel and Major Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenues	$ 154,198	$ 159,957
Direct
Disaggregation Of Revenue [Line Items]
Total revenues	115,094	101,478
National Advertising
Disaggregation Of Revenue [Line Items]
Total revenues	20,295	26,818
Other
Disaggregation Of Revenue [Line Items]
Total revenues	3,949	4,047
Retail
Disaggregation Of Revenue [Line Items]
Total revenues	139,338	132,343
Wholesale
Disaggregation Of Revenue [Line Items]
Total revenues	14,860	27,614
Subscription Advertising and Digital Solutions
Disaggregation Of Revenue [Line Items]
Total revenues	121,314	123,777
Display Advertising
Disaggregation Of Revenue [Line Items]
Total revenues	22,289	26,023
Pay Per Lead
Disaggregation Of Revenue [Line Items]
Total revenues	7,934	7,556
Other
Disaggregation Of Revenue [Line Items]
Total revenues	$ 2,661	$ 2,601