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Recently Adopted Standards and Issued Accounting Standards (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Advertising   $ 169,137 $ 119,896  
Retransmission and carriage   71,060 66,211  
Other   13,994 12,368  
Total operating revenues   254,191 198,475  
Employee compensation and benefits   98,489 94,925  
Programming   83,363 48,723  
Other expenses   53,023 40,766  
Operating Costs and Expenses   $ 238,682 184,414  
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Loss        
Tax effects reclassified related to defined benefits plans       $ 19,400
Customer Concentration Risk | Advertising Contracts        
Concentration risk 65.00%      
Customer Concentration Risk | Retransmission Revenue        
Concentration risk 30.00%      
As Previously Reported        
Advertising     120,111  
Retransmission and carriage     66,211  
Other     10,007  
Total operating revenues     196,329  
Employee compensation and benefits     94,925  
Programming     46,577  
Other expenses     40,766  
Operating Costs and Expenses     182,268  
Adjustments for Adoption of New Revenue Standard | Accounting Standards Update 2014-09        
Advertising     (215)  
Retransmission and carriage     0  
Other     2,361  
Total operating revenues     2,146  
Employee compensation and benefits     0  
Programming     2,146  
Other expenses     0  
Operating Costs and Expenses     $ 2,146