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Revenue - Telecommunications Segment Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 444,770 $ 368,672 $ 1,315,285 $ 1,063,597
Net revenue 501,356 $ 406,409 1,451,825 $ 1,175,629
Telecommunications        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 187,798   580,630  
Other revenue 0   0  
Net revenue 187,798   580,630  
Telecommunications | Termination of long distance minutes        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 187,798   $ 580,630