Intangible Assets and Above-market Leases (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		$ 2,115,200	$ 2,153,966
2019		113,682
2020		113,682
2021		113,682
2022		113,682
2023		77,526
Amortization of Intangible Assets		113,682	115,169	$ 115,226
Finite-Lived Intangible Assets, Accumulated Amortization		1,436,244	1,345,639
Other Intangible Assets, net	[1]	2,558	18,353
Finite-Lived Intangible Assets, Net		678,956	808,327
Depreciation, Amortization and Accretion [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		113,682	113,655	113,635
Site Rental Costs of Operations [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		0	1,514	$ 1,591
Site Rental Contracts and Tenant Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		2,102,864	2,102,864
Finite-Lived Intangible Assets, Accumulated Amortization		1,426,466	1,312,890
Finite-Lived Intangible Assets, Net		676,398	789,974
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		12,336	51,102
Finite-Lived Intangible Assets, Accumulated Amortization		9,778	32,749
Other Intangible Assets, net		$ 2,558	$ 18,353

[1] (a) See "Recently Adopted Accounting Pronouncements" in note 3 to the consolidated financial statements for a discussion of the recently adopted lease standard.