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Commitments and Contingencies (Details 2)
$ in Millions
1 Months Ended 9 Months Ended
Feb. 13, 2018
claim
Aug. 07, 2017
USD ($)
Feb. 14, 2017
patent
Nov. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
Subsidiaries | HNS | Elbit            
Commitment and Contingencies            
Loss Contingency, Damages Awarded, Value | $   $ 21.1   $ 28.5    
Loss Contingency, Attorney's Fees Sought, Value | $         $ 13.9  
Loss Contingency Accrual | $         $ 3.2 $ 2.5
EchoStar Corporation [Member] | HNS | Realtime Data LLC            
Commitment and Contingencies            
Loss Contingency, Invalidated Claims, Number | claim         2  
Loss Contingency, Pending Claims, Number | claim         4  
Loss Contingency, Patents Allegedly Infringed, Number | patent     4      
Patent 728 [Member] | Realtime Data LLC            
Commitment and Contingencies            
Loss Contingency, Pending Claims, Validity Not Challenged | claim 1