Goodwill, Regulatory Authorizations and Other Intangible Assets (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Cost
Balance at the beginning of the period	$ 360,835
Balance at the end of the period	361,300
Accumulated amortization
Balance at the beginning of the period	(280,101)
Balance at the end of the period	(298,665)
Net
Balance at the beginning of the period	80,734
Balance at the end of the period	62,635
Total regulatory authorizations, net
Balance at the beginning of the period	544,633
Additions	(3,751)
Currency Translation Adjustment	4,675
Balance at the end of the period	545,557
Indefinite Lives
Indefinite lives
Balance at the beginning of the period	471,657
Balance at the end of the period	471,657
Finite lives
Cost
Balance at the beginning of the period	87,959
Currency Translation Adjustment	6,086
Balance at the end of the period	94,045
Accumulated amortization
Balance at the beginning of the period	(14,983)
Additions	(3,751)
Currency Translation Adjustment	(1,411)
Balance at the end of the period	(20,145)
Net
Balance at the beginning of the period	72,976
Additions	(3,751)
Currency Translation Adjustment	4,675
Balance at the end of the period	73,900
Brazilian Regulatory Authorization [Member]
Net
Balance at the beginning of the period	38,600
Balance at the end of the period	$ 38,400