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Other Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other liabilities    
Employee compensation and benefits $ 18,520 $ 18,356
Program licenses 54,641 2,440
Liability for pension benefits 207,406 232,788
Liabilities for uncertain tax positions 644 2,416
Other 12,445 17,929
Other liabilities (less current portion) $ 293,656 $ 273,929