Consolidated Statement Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Distributions in Excess of Accumulated Earnings	Accumulated Other Comprehensive Income / (Loss)	Noncontrolling Interests	Common OP Units	Series D Preferred OP Units
Temporary equity, beginning balance at Dec. 31, 2017	$ 43,066
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of stock							$ (60)
Net income	71
Distributions	(171)
Temporary equity, ending balance at Mar. 31, 2018	42,906
Balance at Dec. 31, 2017	2,663,687	$ 797	$ 3,758,533	$ (1,162,001)	$ 1,102	$ 65,256
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock and common OP units, net	(3,296)	2	(3,298)
Conversion of OP units	(59)		(342)			(283)
Share-based compensation - amortization and forfeitures	3,579		3,489	90
Foreign currency translation	(1,861)				(1,772)	(89)
Net income	33,530			31,507		2,023
Distributions	(60,047)			(57,159)		(2,888)
Balance at Mar. 31, 2018	2,635,651	799	3,759,066	(1,187,563)	(670)	64,019
Temporary equity, beginning balance at Dec. 31, 2018	63,592
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of stock							$ 0
Net income	178
Distributions	(272)
Temporary equity, ending balance at Mar. 31, 2019	115,428
Balance at Dec. 31, 2018	3,167,322	864	4,398,949	(1,288,486)	(4,504)	60,499
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock and common OP units, net	(4,321)	$ 1	(4,322)
Conversion of units		0
Conversion of OP units			(280)			(280)
Share-based compensation - amortization and forfeitures	3,793		3,719	74
Temporary Equity, Stock Issued During Period, Value, New Issues								$ 51,930
Foreign currency translation	1,575				1,498	77
Net income	36,949			36,086		863
Distributions	(68,409)		15	(65,279)		(3,145)
Balance at Mar. 31, 2019	$ 3,136,909	$ 865	$ 4,398,641	$ (1,317,605)	$ (3,006)	$ 58,014