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Discontinued Operations (Components Of Discontinued Operations) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Discontinued Operations [Abstract]  
Site leasing revenue $ 5,046us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Income from discontinued operations, net of taxes $ 2,296us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax