Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013		2012		2011
		(in thousands)
Beginning balance	$	246	$	135	$	263
Provision for doubtful accounts		770		330		70
Write-offs, net of recoveries		(330)		(219)		(198)
Ending balance	$	686	$	246	$	135

Summary Of Asset Retirement Obligation Activity

	For the year ended December 31,
	2013		2012		2011
	(in thousands)
Beginning balance	$	7,506	$	5,386	$	5,214
Additions		597		2,261		9
Currency translation adjustment		(42)		1		(2)
Accretion expense		512		333		250
Removal		(407)		(334)		—
Revision in estimates		(2,854)		(141)		(85)
Ending balance	$	5,312	$	7,506	$	5,386