Consolidated Statement Of Changes In Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Treasury shares [Member]	Accumulated other comprehensive income (loss) [Member]	Distributions in excess of net income [Member]	Distributions in excess of net income [Member] Cumulative Effect, Period of Adoption, Adjustment	Series C Preferred Shares [Member]	Series C Preferred Shares [Member] Distributions in excess of net income [Member]	Series E Preferred Shares [Member]	Series E Preferred Shares [Member] Distributions in excess of net income [Member]	Series G Preferred Stock [Member]	Series G Preferred Stock [Member] Distributions in excess of net income [Member]	Performance Shares [Member]	Performance Shares [Member] Distributions in excess of net income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	$ 3,005,805	$ (2,163)	$ 816	$ 148	$ 3,834,858	$ (147,435)	$ 7,275	$ (689,857)	$ (2,163)
Balance (in shares) at Dec. 31, 2019			81,588,489	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			211,549
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	6,133		$ 2		6,221	(90)
Treasury Stock, Retired, Cost Method, Amount	(6,769)					(6,769)
Employee Service Share Based Compensation Restricted Stock Units And Restricted Shares Unrecognized Compensation Cost On Nonvested Awards	3,509				3,509
Foreign currency translation adjustment	(16,495)						(16,495)
Unrealized Gain (Loss) on Derivatives	3,931						3,931
Net income	37,118							37,118
Issuances of common shares (in shares)			10,368
Issuances of common shares	442		$ 0		442
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			1,410
Stock Issued During Period, Value, Stock Options Exercised	$ 0		$ 0		(63)	(63)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.1325
Dividends to common and preferred shareholders	$ (88,996)							(88,996)		$ (1,939)	$ (1,939)	$ (1,939)	$ (1,939)	$ (2,156)	$ (2,156)
Preferred Stock, Dividends, Per Share, Cash Paid										$ 0.359375		$ 0.5625		$ 0.359375
Balance (in shares) at Mar. 31, 2020			81,811,816	14,841,431
Balance (in shares) at Dec. 31, 2019			81,588,489	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(5,063)
Unrealized Gain (Loss) on Derivatives	(4,318)
Net income	$ (111,751)
Balance (in shares) at Sep. 30, 2020			81,908,330	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Total equity	$ 2,936,481		$ 818	$ 148	3,845,093	(154,357)	(5,289)	(749,932)
Balance (in shares) at Mar. 31, 2020			81,811,816	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Service Share Based Compensation Restricted Stock Units And Restricted Shares Unrecognized Compensation Cost On Nonvested Awards	3,463				3,463
Foreign currency translation adjustment	7,284						7,284
Unrealized Gain (Loss) on Derivatives	(6,326)						(6,326)
Net income	(62,965)							(62,965)
Issuances of common shares (in shares)			17,203
Issuances of common shares	428		$ 0		428
Stock Repurchased During Period, Value	$ (105,994)					(105,994)
Common Stock, Dividends, Per Share, Cash Paid	$ 0.3825
Dividends to common and preferred shareholders	$ (30,062)							(30,062)		$ (1,939)	(1,939)	$ (1,939)	(1,939)	$ (2,156)	(2,156)	$ (19)	$ (19)
Preferred Stock, Dividends, Per Share, Cash Paid										$ 0.359375		$ 0.5625		$ 0.359375
Balance (in shares) at Jun. 30, 2020			81,903,786	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Other	1		$ 1
Stock Issued During Period, Shares, Other			74,767
Total equity	2,736,257		$ 819	$ 148	3,848,984	(260,351)	(4,331)	(849,012)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0
Restricted Stock Award, Forfeitures					220	(220)
Treasury Stock, Retired, Cost Method, Amount	(23)					(23)
Employee Service Share Based Compensation Restricted Stock Units And Restricted Shares Unrecognized Compensation Cost On Nonvested Awards	3,410				3,410
Foreign currency translation adjustment	4,148						4,148
Unrealized Gain (Loss) on Derivatives	(1,923)						(1,923)
Net income	(85,904)							(85,904)
Issuances of common shares (in shares)			4,544
Issuances of common shares	148		$ 0		148
Dividends to common and preferred shareholders										$ (1,939)	(1,939)	$ (1,939)	(1,939)	$ (2,156)	(2,156)	(10)	(10)
Preferred Stock, Dividends, Per Share, Cash Paid										$ 0.359375		$ 0.5625		$ 0.359375
Balance (in shares) at Sep. 30, 2020			81,908,330	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	2,650,069		$ 819	$ 148	3,852,762	(260,594)	(2,106)	(940,960)
Total equity	2,630,585		$ 819	$ 148	3,857,632	(261,238)	216	(966,992)
Balance (in shares) at Dec. 31, 2020			81,917,876	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			246,562
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	2,901		$ 2		2,899	0
Treasury Stock, Retired, Cost Method, Amount	(2,744)					(2,744)
Employee Service Share Based Compensation Restricted Stock Units And Restricted Shares Unrecognized Compensation Cost On Nonvested Awards	3,784				3,784
Foreign currency translation adjustment	2,300						2,300
Unrealized Gain (Loss) on Derivatives	462						462
Net income	3,380							3,380
Issuances of common shares (in shares)			2,509
Issuances of common shares	107		$ 0		107
Dividends to common and preferred shareholders										$ (1,939)	(1,939)	$ (1,939)	(1,939)	$ (2,156)	(2,156)	(8)	(8)
Preferred Stock, Dividends, Per Share, Cash Paid										$ 0.359375		$ 0.5625		$ 0.359375
Balance (in shares) at Mar. 31, 2021			82,166,947	14,841,431
Balance (in shares) at Dec. 31, 2020			81,917,876	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(195)
Unrealized Gain (Loss) on Derivatives	6,355
Net income	$ 54,049
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	4,065
Balance (in shares) at Sep. 30, 2021			82,219,663	14,840,297
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	$ 2,634,733		$ 821	$ 148	3,864,422	(263,982)	2,978	(969,654)
Balance (in shares) at Mar. 31, 2021			82,166,947	14,841,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0
Restricted Stock Award, Forfeitures					484	(484)
Employee Service Share Based Compensation Restricted Stock Units And Restricted Shares Unrecognized Compensation Cost On Nonvested Awards	3,675				3,675
Foreign currency translation adjustment	2,674						2,674
Unrealized Gain (Loss) on Derivatives	(387)						(387)
Net income	18,552							18,552
Issuances of common shares (in shares)			1,826
Issuances of common shares	90		$ 0		90
Stock Redeemed or Called During Period, Value	0
Stock Redeemed or Called During Period, Shares				(800)
Stock Issued During Period, Shares, Conversion of Convertible Securities			330
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			4,065
Stock Issued During Period, Value, Stock Options Exercised	0		$ 0		(194)	(194)
Dividends to common and preferred shareholders										$ (1,938)	(1,938)	$ (1,939)	(1,939)	$ (2,156)	(2,156)	(10)	(10)
Preferred Stock, Dividends, Per Share, Cash Paid										$ 0.359375		$ 0.5625		$ 0.359375
Balance (in shares) at Jun. 30, 2021			82,216,474	14,840,631
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Other	1		$ 1
Stock Issued During Period, Shares, Other			43,306
Total equity	2,653,295		$ 822	$ 148	3,868,865	(264,660)	5,265	(957,145)
Treasury Stock, Retired, Cost Method, Amount	(19)					(19)
Employee Service Share Based Compensation Restricted Stock Units And Restricted Shares Unrecognized Compensation Cost On Nonvested Awards	3,759				3,759
Foreign currency translation adjustment	(5,169)						(5,169)
Unrealized Gain (Loss) on Derivatives	6,280						6,280
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	3,249						3,249
Net income	32,117							32,117
Issuances of common shares (in shares)			3,051
Issuances of common shares	153		$ 0		153
Stock Redeemed or Called During Period, Value	$ 0
Stock Redeemed or Called During Period, Shares				(334)
Stock Issued During Period, Shares, Conversion of Convertible Securities			138
Common Stock, Dividends, Per Share, Cash Paid	$ 0.75
Dividends to common and preferred shareholders	$ (56,104)							(56,104)		$ (1,938)	$ (1,938)	$ (1,939)	$ (1,939)	$ (2,156)	$ (2,156)	$ (47)	$ (47)
Preferred Stock, Dividends, Per Share, Cash Paid										$ 0.359375		$ 0.5625		$ 0.359375
Balance (in shares) at Sep. 30, 2021			82,219,663	14,840,297
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	$ 2,631,481		$ 822	$ 148	$ 3,872,777	$ (264,679)	$ 9,625	$ (987,212)