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Acquisitions (Schedule Of Acquisition Capital Expenditures) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Acquisitions [Abstract]        
Towers and related intangible assets $ 71,688,000 $ 80,326,000 $ 1,019,733,000 $ 311,191,000
Ground lease land purchases 9,586,000 [1] 11,320,000 [1] 29,015,000 [1] 35,864,000 [1]
Total cash acquisition capital expenditures 81,274,000 91,646,000 1,048,748,000 347,055,000
Ground lease extensions $ 2,700,000 $ 2,800,000 $ 7,800,000 $ 7,600,000
[1] In addition, the Company paid $2.7 million and $2.8 million for ground lease extensions and term easements during the three months ended September 30, 2014 and 2013, respectively, and $7.8 million and $7.6 million for ground lease extensions during the nine months ended September 30, 2014 and 2013, respectively. The Company recorded these amounts in prepaid rent on its Consolidated Balance Sheets.