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Related Party Transactions - Narrative Part 3 (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 01, 2017
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2009
Related Party Transaction [Line Items]            
Selling, general and administrative expenses   $ 333,074 $ 422,249      
Meridian Lease Agreement            
Related Party Transaction [Line Items]            
Additional term of renewal option       1 year    
Santa Fe Lease Agreement            
Related Party Transaction [Line Items]            
Additional term of renewal option       1 year 1 year  
EchoStar            
Related Party Transaction [Line Items]            
Selling, general and administrative expenses   $ 3,000 $ 4,000      
Dish Network | EchoStar | 90 Inverness Lease Agreement            
Related Party Transaction [Line Items]            
Agreement Renewal Option Term 3 years          
Dish Network | EchoStar | Professional Services Agreement            
Related Party Transaction [Line Items]            
Minimum notice period for termination of agreement           60 days
Minimum notice period for termination of a specific service           30 days
Agreement term           1 year