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Segment Data (Schedule of Segment Reporting Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Revenues $ 483,849 $ 467,221 $ 456,322 $ 458,303 $ 443,073 $ 433,945 $ 427,294 $ 423,362 $ 1,865,695 $ 1,727,674 $ 1,633,125
Cost of revenues                 468,795 446,312 420,897
Operating profit                 1,396,900 1,281,362 1,212,228
Selling, general, and administrative                 142,526 130,697 143,349
Acquisition related adjustments and expenses                 10,961 12,367 13,140
Asset impairment and decommission costs                 27,134 36,697 30,242
Depreciation, amortization and accretion 169,454 167,703 169,558 165,398 162,643 161,907 159,520 159,030 672,113 643,100 638,189
Operating income 150,321 $ 138,006 $ 125,870 $ 129,969 119,081 $ 117,011 $ 114,590 $ 107,819 544,166 458,501 387,308
Other expense (principally interest expense and other expense)                 (492,482) (341,610) (300,005)
Income before provision for income taxes                 51,684 116,891 87,303
Cash capital expenditures                 602,680 588,845 418,203
Assets 7,213,707       7,320,205       7,213,707 7,320,205  
Provision for doubtful accounts                 551 2,909 22,516
Domestic Site Leasing [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 1,400,095 1,308,389 1,273,866
Cost of revenues                 266,131 260,826 260,941
Operating profit                 1,133,964 1,047,563 1,012,925
Selling, general, and administrative                 72,879 67,263 72,701
Acquisition related adjustments and expenses                 5,268 8,171 6,233
Asset impairment and decommission costs                 18,857 29,523 26,073
Depreciation, amortization and accretion                 511,823 498,842 509,108
Operating income                 525,137 443,764 398,810
Cash capital expenditures                 338,610 225,074 310,256
Assets 5,035,826       5,171,190       5,035,826 5,171,190  
International Site Leasing [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 340,339 314,784 264,204
Cost of revenues                 106,165 98,701 81,274
Operating profit                 234,174 216,083 182,930
Selling, general, and administrative                 27,082 24,320 35,897
Acquisition related adjustments and expenses                 5,693 4,196 6,907
Asset impairment and decommission costs                 7,932 6,994 1,824
Depreciation, amortization and accretion                 151,570 135,155 119,466
Operating income                 41,897 45,418 18,836
Cash capital expenditures                 258,785 358,691 102,282
Assets 2,042,800       2,028,479       2,042,800 2,028,479  
Site Development [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 125,261 104,501 95,055
Cost of revenues                 96,499 86,785 78,682
Operating profit                 28,762 17,716 16,373
Selling, general, and administrative                 16,215 15,433 13,039
Asset impairment and decommission costs                 345 180  
Depreciation, amortization and accretion                 2,556 2,580 3,402
Operating income                 9,646 (477) (68)
Cash capital expenditures                 1,561 1,221 1,955
Assets 60,775       49,487       60,775 49,487  
Not Identified by Segment [Member]                      
Segment Reporting Information [Line Items]                      
Selling, general, and administrative                 26,350 23,681 21,712
Asset impairment and decommission costs                     2,345
Depreciation, amortization and accretion                 6,164 6,523 6,213
Operating income                 (32,514) (30,204) (30,270)
Other expense (principally interest expense and other expense)                 (492,482) (341,610) (300,005)
Cash capital expenditures                 3,724 3,859 $ 3,710
Assets $ 74,306       $ 71,049       $ 74,306 71,049  
Oi S.A. [Member]                      
Segment Reporting Information [Line Items]                      
Provision for doubtful accounts                   $ 16,498