Income Taxes (Benefit (Provision) for Income Taxes) (Details) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Current Federal														$ 495	$ 213	$ 684
Current Foreign														(5,675)	(6,413)	(5,110)
Current State														(3,981)	(4,415)	(12,305)
Total current														(9,161)	(10,615)	(16,731)
Deferred Federal														44,716	23,070	(164,769)
Deferred Foreign														(1,048)	(819)	(130)
Deferred State														16,950	(392)	(9,370)
Total deferred														60,618	21,859	(174,269)
Benefit (provision) for income taxes		$ 42,077		$ 3,801		$ 4,144		$ 1,435		$ (3,126)	$ (1,977)	$ (3,101)	$ (3,040)	51,457	11,244	(191,000)
Tax adjustment related to the small cell REIT conversion	[2]													$ 33,759	$ 0	$ 0

[1] Inclusive of the tax adjustment of $33.8 million in conjunction with the inclusion of small cells in the REIT in January 2016 . See also notes 11 and 19.

[2] During the fourth quarter of 2015, the Company de-recognized the net deferred tax liabilities related to the Company's small cells previously included in one or more TRSs in conjunction with the inclusion of small cells in the REIT in January 2016.