Schedule II - Valuation and Qualifying Accounts Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2015

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts Disclosure [Text Block]

			Additions		Deductions
	Balance at Beginning of Year		Charged to Operations		Credited to Operations		Written Off			Effect of Exchange Rate Changes		Balance at End of Year
Allowance for Doubtful Accounts Receivable:
2015	$	10,037	$	2,958	$	—	$	(3,421	)			$	9,574
2014	$	7,547	$	3,101	$	—	$	(611	)	$	—	$	10,037
2013	$	7,562	$	1,351	$	—	$	(1,366	)	$	—	$	7,547

			Additions				Deductions
	Balance at Beginning of Year		Charged to Operations		Charged to Additional Paid-in Capital and Other Comprehensive Income		Credited to Operations			Credited to Additional Paid-in Capital and Other Comprehensive Income		Other Adjustments(a)			Balance at End of Year
Deferred Tax Valuation Allowance:
2015	$	21,038	$	164	$	—	$	(3,000	)	$	—	$	(16,208	)	$	1,994
2014	$	27,264	$	1,797	$	—	$	(9,106	)	$	—	$	1,083		$	21,038
2013	$	70,940	$	717	$	—	$	(2,174	)	$	—	$	(42,219	)	$	27,264

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