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Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Other liabilities    
Employee compensation and benefits $ 20,424 $ 18,520
Programming liability 55,318 54,641
Liability for pension benefits 200,843 207,406
Liabilities for uncertain tax positions 676 644
Other 12,769 12,445
Other liabilities (less current portion) $ 290,030 $ 293,656