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Discontinued Operations (Components Of Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2012
Discontinued Operations [Abstract]
Site leasing revenue				$ 5,046
Income from discontinued operations, net of taxes	$ (53)	$ 969	$ 1,380	$ 2,296

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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