Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2018

Intangible Assets, Net [Abstract]

Gross and Net Carrying Amounts for each Major Class of Intangible Assets

	As of March 31, 2018						As of December 31, 2017
	Gross carrying		Accumulated		Net book		Gross carrying		Accumulated		Net book
	amount		amortization		value		amount		amortization		value
	(in thousands)
Current contract intangibles	$	4,425,965	$	(1,746,160)	$	2,679,805	$	4,355,171	$	(1,673,270)	$	2,681,901
Network location intangibles		1,649,246		(728,411)		920,835		1,617,441		(701,211)		916,230
Intangible assets, net	$	6,075,211	$	(2,474,571)	$	3,600,640	$	5,972,612	$	(2,374,481)	$	3,598,131