Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands		12 Months Ended
	Nov. 25, 2014 USD ($) entity	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Summary of Significant Accounting Policies [Line Items]
Proceeds from sale of other investments		$ 700	$ 89,700
Gain on sale of investments		0	38,326	$ 12,461
Cost-method investments, carrying value		8,100	8,800
Cost-method investments, impairment loss		0	0	0
Interest cost capitalized		1,000	800	300
Long-term debt		8,775,583	8,452,070
Deferred lease costs		10,200	10,900	12,400
Amortization expense		11,300	9,000	6,800
Unamortized deferred lease costs		$ 29,700	30,600
Intangible assets, useful life		15 years
Impairment charge recognized, related to long-lived assets		$ 30,200	94,800	23,800
Provision for doubtful accounts		$ 22,516	896	365
Business acquistions period after closing date to determine additional adjustments		1 year
Acquired intangible assets, useful life		15 years
Number of wholly owned subsidiaries that entered into intercompany loan agreement | entity	2
Intercompany loan maximum lend/borrow amount	$ 750,000
Intercompany foreign currency outstanding balance		$ 433,300
Loss on remeasurement of U.S. denominated intercompany loan		90,030	(178,854)	$ (22,965)
Restatement Adjustment [Member] | Accounting Standards Update 2015-03 [Member]
Summary of Significant Accounting Policies [Line Items]
Deferred financing fees			(90,200)
Long-term debt			$ 90,200
Oi S.A. [Member]
Summary of Significant Accounting Policies [Line Items]
Provision for doubtful accounts		$ 16,500
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Lease term		5 years
Duration of site development projects		3 months
Business acquisitions performance target period		1 year
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Lease term		10 years
Duration of site development projects		12 months
Business acquisitions performance target period		3 years
Site Development Revenue [Member] | Revenue [Member]
Summary of Significant Accounting Policies [Line Items]
Concentration risk percentage of revenue		6.00%