Consolidated Statement Of Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Distributions in Excess of Accumulated Earnings	Accumulated Other Comprehensive Income / (Loss)	Noncontrolling Interests	Series A Preferred Stock	Series A-4 Preferred Stock	Series A-4 Preferred Stock Additional Paid-in Capital	Series A-4 preferred OP units	Series A-4 preferred OP units Additional Paid-in Capital
Balance at Dec. 31, 2016	$ 2,362,227	$ 732	$ 3,321,441	$ (1,023,415)	$ (3,181)	$ 66,616	$ 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock and common OP units, net	486,559	59	484,499			2,001
Conversion of OP units	233	1	3,240			(3,008)
Conversion of Series A-4 preferred stock	4,720	1	4,719
Adjustments to Additional Paid in Capital, Redemption of Stock								$ (3,867)	$ (3,867)	$ (2,571)	$ (2,571)
Share-based compensation - amortization and forfeitures	9,893		9,670	223
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(100)		(6,201)			6,101
Foreign currency exchange	4,977				4,712	265
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest and Returns from Preferred Stock	71,289			67,298		3,991
Distributions	(169,791)			(161,334)		(8,457)
Balance at Sep. 30, 2017	$ 2,763,569	$ 793	$ 3,810,930	$ (1,117,228)	$ 1,531	$ 67,509	$ 34