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Goodwill and intangible assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Goodwill and intangible assets    
Broadcast license $ 41,356 $ 41,356
Goodwill 164,887 164,887
Other intangibles 48,380 51,661
Total intangible assets $ 254,623 $ 257,904