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COMMITMENTS AND CONTINGENCIES Operating Lease Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2018 $ 2,732  
2019 2,532  
2020 1,970  
2021 1,305  
2022 1,188  
2023 and thereafter 2,751  
Total 12,478  
Purchase Commitment [Member]    
Long-term Purchase Commitment [Line Items]    
2018 23,574  
2019 18,647  
2020 13,157  
2021 5,313  
2022 403  
2023 and thereafter 1,680  
Total 62,774 $ 108,800
Transmission Service Agreement [Member]    
Long-term Purchase Commitment [Line Items]    
2018 [1] 12,614  
2019 [1] 8,316  
2020 [1] 2,678  
2021 [1] 2,758  
2022 [1] 3,086  
2023 and thereafter [1] 0  
Total [1] 29,452  
Machinery and Equipment [Member]    
Long-term Purchase Commitment [Line Items]    
2018 503  
2019 0  
2020 0  
2021 0  
2022 0  
2023 and thereafter 0  
Total $ 503  
[1] (1) Other commitments are primarily comprised of digital transmission commitments.