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Related Party Transactions - Part 5 (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 19, 2016
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 28, 2017
Related Party Transaction [Line Items]              
Sales   $ 1,295 $ 1,381        
Rovi License Agreement              
Related Party Transaction [Line Items]              
Agreement term 10 years            
Payments to Related Parties   0   $ 0      
EchoStar              
Related Party Transaction [Line Items]              
Purchases from NagraStar   1,000 1,000        
NagraStar L.L.C              
Related Party Transaction [Line Items]              
Interest on equity method investment       50.00%     50.00%
Purchases from NagraStar   11,770 14,092 $ 53,902 $ 56,284 $ 72,162  
Amounts payable to NagraStar   7,893   9,038 9,630    
Commitments to NagraStar   $ 4,171   $ 3,260 4,893    
Dish Mexico              
Related Party Transaction [Line Items]              
Interest on equity method investment   49.00%   49.00%      
Amounts receivable   $ 2,942   $ 3,343      
Dish Mexico | Digital receivers and related components              
Related Party Transaction [Line Items]              
Sales       5,095 5,620 5,426  
Dish Mexico | Uplink services              
Related Party Transaction [Line Items]              
Sales   $ 1,295 $ 1,381 $ 5,095 $ 5,620 $ 6,653