Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

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,
	2011			2010			2009
				(in thousands)
Beginning balance	$	263		$	350		$	852
Allowance recorded relating to acquisitions		—			—			10
Provision for doubtful accounts		70			630			465
Write-offs, net of recoveries		(198	)		(717	)		(977	)
Ending balance	$	135		$	263		$	350

Summary Of Asset Retirement Obligation Activity

	For the year ended December 31,
	2011			2010
	(in thousands)
Asset retirement obligation at January 1	$	5,214		$	4,641
Additional liabilities accrued		9			320
Currency translation adjustment		(2	)		—
Accretion expense		250			323
Revision in estimates		(85	)		(70	)
Ending balance	$	5,386		$	5,214