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Commitments and Contingencies (Pre-Acquisition Contingencies and Receivables) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
CDC Brasil S A [Member]    
Assets    
Prepaid expenses and other assets (current) $ 0 $ 2,212
Other assets (noncurrent) 0 0
Liabilities    
Other current liabilities 0 2,212
Other long-term liabilities 0 0
Network1 [Member]    
Assets    
Prepaid expenses and other assets (current) 1,385 1,294
Other assets (noncurrent) 5,700 8,235
Liabilities    
Other current liabilities 1,385 1,294
Other long-term liabilities $ 5,700 $ 8,235