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Legal and Regulatory Proceedings (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Plaintiffs
Dec. 31, 2018
USD ($)
Jul. 23, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 22, 2018
USD ($)
Sep. 30, 2017
USD ($)
Legal and Regulatory Proceedings (Textual)              
Total settlement payment   $ 200          
Selling, general and administrative expense [1]   72,467 $ 61,544        
Accrued expenses   26,116 25,242 $ 16,000      
Other current liabilities   $ 2,704 3,279        
Related revenue reduction     1,700        
Number of plaintiffs | Plaintiffs   3          
GRE [Member]              
Legal and Regulatory Proceedings (Textual)              
Accrued expenses   $ 200          
Settlement Agreement [Member]              
Legal and Regulatory Proceedings (Textual)              
Total settlement payment $ 5,000            
Selling, general and administrative expense     1,700        
New Jersey Office and Attorney General [Member]              
Legal and Regulatory Proceedings (Textual)              
Total payments reasonable settlement           $ 1,200  
Accrued expenses             $ 1,500
New York PSC [Member]              
Legal and Regulatory Proceedings (Textual)              
Gross revenue   63,200 74,200        
IDT Energy [Member]              
Legal and Regulatory Proceedings (Textual)              
Total payments reasonable settlement           $ 1,400  
Ohio Public Utilities Commission [Member]              
Legal and Regulatory Proceedings (Textual)              
Accrued expenses         $ 200    
Gross revenue   600 1,400        
Stock Granted, Value, Share-based Compensation, Forfeited   200          
State of Connecticut Public Utilities Regulatory Authority [Member]              
Legal and Regulatory Proceedings (Textual)              
Gross revenue   35,600 24,800        
State of Illinois Office of Attorney General [Member]              
Legal and Regulatory Proceedings (Textual)              
Total payments reasonable settlement   3,000          
Other current liabilities         $ 3,000    
Gross revenue   $ 10,100 $ 16,500        
[1] Stock-based compensation included in selling, general and administrative expenses