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Schedule III - Schedule of Real Estate and Accumulated Depreciation (Reconciliation of Carrying Amount of Real Estate Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule III - Schedule of Real Estate and Accumulated Depreciation [Abstract]      
Gross amount at beginning $ 5,340,858 $ 5,079,660 $ 4,839,874
Acquisitions 131,686 112,979 72,456
Construction and related costs on new builds 54,237 70,361 58,143
Augmentation and tower upgrades 49,201 43,288 37,861
Land buyouts and other assets 37,032 41,657 44,574
Tower maintenance 30,048 29,391 28,257
Other     45,829
Total additions 302,204 297,676 287,120
Cost of real estate sold or disposed (1,083) (1,027) (12,842)
Impairment (17,130) (34,101) (34,492)
Other (63,844) (1,350)  
Total deductions (82,057) (36,478) (47,334)
Balance at end $ 5,561,005 $ 5,340,858 $ 5,079,660