Consolidated Statement Of Changes In Equity - USD ($) $ in Thousands	Total	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]	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	$ 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	2,634,733	$ 821	$ 148	3,864,422	(263,982)	2,978	(969,654)
Total equity	2,618,039	$ 822	$ 148	3,876,817	(264,817)	9,955	(1,004,886)
Balance (in shares) at Dec. 31, 2021		82,225,061	14,840,297
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Other		2,794
Stock Issued During Period, Value, Other	0
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		243,286
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	4,416	$ 3		4,496	(83)
Treasury Stock, Retired, Cost Method, Amount	(4,250)				(4,250)
Employee Service Share Based Compensation Restricted Stock Units And Restricted Shares Unrecognized Compensation Cost On Nonvested Awards	4,245			4,245
Foreign currency translation adjustment	2,606					2,606
Unrealized Gain (Loss) on Derivatives	(2,090)					(2,090)
Net income	42,192						42,192
Issuances of common shares (in shares)		4,730
Issuances of common shares	$ 228	$ 0		228
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	9,799	9,799
Stock Issued During Period, Value, Stock Options Exercised	$ 4	$ 0		(454)	(458)
Common Stock, Dividends, Per Share, Cash Paid	$ 0.775
Dividends to common and preferred shareholders	$ (58,099)						(58,099)	$ (1,938)	$ (1,938)	$ (1,939)	$ (1,939)	$ (2,156)	$ (2,156)	$ (136)	$ (136)
Preferred Stock, Dividends, Per Share, Cash Paid								$ 0.359375		$ 0.5625		$ 0.359375
Balance (in shares) at Mar. 31, 2022		82,485,670	14,840,297
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	$ 2,601,114	$ 825	$ 148	$ 3,886,240	$ (269,608)	$ 10,471	$ (1,026,962)