Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Summary Of Significant Accounting Policies [Abstract]

Schedule Of Asset Classes And Related Estimated Useful Lives

Towers and related components	3 - 15  years
Furniture, equipment and vehicles	2 - 7 years
Buildings and improvements	5 - 10  years

Allowance For Doubtful Accounts

	For the year ended December 31,
	2014		2013		2012
		(in thousands)
Beginning balance	$	686	$	246	$	135
Provision for doubtful accounts		338		770		330
Write-offs, net of recoveries		(135)		(330)		(219)
Ending balance	$	889	$	686	$	246

Summary Of Asset Retirement Obligation Activity

	For the year ended December 31,
	2014		2013		2012
	(in thousands)
Beginning balance	$	5,312	$	7,506	$	5,386
Additions		599		597		2,261
Currency translation adjustment		(161)		(42)		1
Accretion expense		446		512		333
Removal		(188)		(407)		(334)
Revision in estimates		(152)		(2,854)		(141)
Ending balance	$	5,856	$	5,312	$	7,506