Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year		$ 10,037	$ 7,547	$ 7,562
Charged to operations		2,958	3,101	1,351
Credited to operations		0	0	0
Written off		$ (3,421)	(611)	(1,366)
Effect of exchange rate changes or Other adjustments			0	0
Balance at end of year		$ 9,574	10,037	7,547
Deferred Tax Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year		21,038	27,264	70,940
Charged to operations		164	1,797	717
Credited to operations		0	0	0
Written off		(3,000)	(9,106)	(2,174)
Effect of exchange rate changes or Other adjustments		0	0	0
Valuation allowance and reserves, other adjustments	[1]	(16,208)	1,083	(42,219)
Balance at end of year		$ 1,994	$ 21,038	$ 27,264

[1] Inclusive of (1) the effects of acquisitions, (2) the REIT conversion, and (3) the inclusion of small cells in the REIT in January 2016.