Schedule III Real Estate and Accumulated Depreciation - Reconciliation of Carrying Amount of Real Estate Investments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance, beginning of period	$ 7,006,695	$ 6,308,992	$ 5,220,450
Additions (acquisitions and improvements)	1,172,855	997,534	1,146,126
Disposals	(9,295)	(16,444)	(14,864)
Foreign currency transaction adjustments and others	(298,365)	(283,387)	(42,720)
Balance, end of year	$ 7,871,890	$ 7,006,695	$ 6,308,992