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Program Production Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 25, 2016
Program Production Costs [Abstract]    
Released, less amortization $ 40,386 $ 35,683
Theatrical Film Costs, Production 20,553 20,271
In production 31,596 25,062
Pre-production 326 1,833
Total program production costs $ 92,861 $ 82,849
Period of amortization for the unamortized television programming costs related to released productions next four years  
Amortization expected for the released programs in next operating period $ 35,000