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Related Party Transactions - Narrative Part 1 (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]          
Trade accounts receivable $ 581,770   $ 626,375 $ 568,679  
Trade accounts payable 378,460   315,661 266,417  
Broadband, Wireless and Other Segments          
Related Party Transaction [Line Items]          
Expenses associated with services 20,000 $ 21,000 72,000 54,000 $ 40,000
Office Space from DISH Network          
Related Party Transaction [Line Items]          
Expenses associated with services 2,000 2,000 7,000 3,000  
EchoStar          
Related Party Transaction [Line Items]          
Expenses associated with services 1,000 1,000      
Trade accounts receivable 1,000   1,000 1,000  
Trade accounts payable 3,000   1,000 3,000  
Equipment sales and other revenue 1,000 1,000 $ 4,000 $ 6,000 $ 8,000
Dish Network          
Related Party Transaction [Line Items]          
Expenses associated with services $ 56,000 $ 56,000