Goodwill and intangible assets (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016
Changes in other amortizable intangible assets
Balance at the beginning of the period	$ 61,499
Additions	23
Amortization	(3,357)	$ (3,400)
Net balance at the end of the period	58,165
Future estimated amortization expense
2016			$ 10,073
2017			13,257
2018			13,187
2019			8,432
2020 and thereafter			13,216
Total	$ 61,499		58,165
Weighted Average
Future estimated amortization expense
Remaining amortization period	4 years 9 months 18 days
Affiliate relationships
Changes in other amortizable intangible assets
Balance at the beginning of the period	$ 56,766
Amortization	(3,075)
Net balance at the end of the period	53,691
Future estimated amortization expense
Total	56,766		53,691
Advertiser relationships
Changes in other amortizable intangible assets
Balance at the beginning of the period	2,344
Amortization	(138)
Net balance at the end of the period	2,206
Future estimated amortization expense
Total	2,344		2,206
Non-compete agreements
Changes in other amortizable intangible assets
Balance at the beginning of the period	2,333
Amortization	(137)
Net balance at the end of the period	2,196
Future estimated amortization expense
Total	2,333		2,196
Other intangibles
Changes in other amortizable intangible assets
Balance at the beginning of the period	56
Additions	23
Amortization	(7)
Net balance at the end of the period	72
Future estimated amortization expense
Total	$ 56		$ 72