Equity method investments - (Details) $ in Thousands			3 Months Ended	9 Months Ended
	Apr. 28, 2017	Nov. 30, 2016 item	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	May 01, 2017	Nov. 03, 2016
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments			$ 2,571	$ 2,450
Equity method investments			24,406	24,406
PANTAYA
Schedule of Equity Method Investments [Line Items]
Ownership Percentage						25.00%
Loss from equity method investments			400	400
Colombian content producers, Radio television and NTC nacional | Television broadcast license
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					20.00%
License life (in years)		10 years
Number of national broadcast television networks | item		3
Loss from equity method investments			$ 2,300	2,200
Losses in excess of the common equity (as a percent)			100.00%
Equity method investments			$ 21,700	21,700
Return on capital equity investment			600	800
REMEZCLA
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.50%
Loss from equity method investments			100	100
Equity method investments			5,000	5,000
Return on capital equity investment			$ 300	$ 300
REMEZCLA | Minimum
Schedule of Equity Method Investments [Line Items]
Target age of people English speaking and bilingual U.S. Hispanics	18 years
REMEZCLA | Maximum
Schedule of Equity Method Investments [Line Items]
Target age of people English speaking and bilingual U.S. Hispanics	35 years