Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Treasury Shares	Add'l Paid in Capital	Accumulated Earnings	Accumulated Other Comprehensive Income	Non controlling Interest
Beginning balance, shares at Dec. 31, 2018		0	80,843,472	1,853,148
Beginning balance at Dec. 31, 2018	$ 2,325,209	$ 0	$ 809	$ (58,114)	$ 896,811	$ 1,349,627	$ 14,563	$ 121,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of preferred shares, net of offering expenses, shares		3,450,000
Issuance of preferred shares, net of offering expenses	83,058	$ 86,250			(3,192)
Share-based compensation, shares			170,231
Share-based compensation	1,818		$ 2		1,816
Treasury shares acquired, shares				2,636,534
Treasury shares acquired	(83,293)			$ (83,293)
Share repurchase to settle shareholder tax obligations, shares			(31,506)
Share repurchase to settle shareholder tax obligations	(978)				(978)
Net income (loss)	92,811					92,219		592
Other comprehensive income (loss)	(16,029)					(432)	(15,597)
Purchase of noncontrolling interests	(71,000)				11,707			(82,707)
Distributions to noncontrolling interests	(2,078)							(2,078)
Common shares dividend declared	(40,923)					(40,923)
Ending balance, shares at Mar. 31, 2019		3,450,000	80,982,197	4,489,682
Ending balance at Mar. 31, 2019	2,288,595	$ 86,250	$ 811	$ (141,407)	906,164	1,400,491	(1,034)	37,320
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of preferred shares, net of offering expenses, shares		5,750,000
Issuance of preferred shares, net of offering expenses	138,732	$ 143,750			(5,018)
Share-based compensation, shares			41,535
Share-based compensation	3,653		$ 0		3,653
Treasury shares acquired, shares				2,347,826
Treasury shares acquired	(73,942)			$ (73,942)
Net income (loss)	86,096					86,096
Other comprehensive income (loss)	(33,408)						(33,408)
Purchase of noncontrolling interests	(32,177)				5,143			(37,320)
Common shares dividend declared	(39,108)					(39,108)
Preferred shares dividend declared	(1,833)					(1,833)
Ending balance, shares at Jun. 30, 2019		9,200,000	81,023,732	6,837,508
Ending balance at Jun. 30, 2019	2,336,608	$ 230,000	$ 811	$ (215,349)	909,942	1,445,646	(34,442)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation, shares			92,997
Share-based compensation	1,767		$ 1		1,766
Treasury shares acquired, shares				1,604,803
Treasury shares acquired	(51,884)			$ (51,884)
Share repurchase to settle shareholder tax obligations, shares			(143,390)
Share repurchase to settle shareholder tax obligations	(4,688)		$ (2)		(4,686)
Net income (loss)	90,603					90,603
Other comprehensive income (loss)	(21,943)						(21,943)
Common shares dividend declared	(38,064)					(38,064)
Preferred shares dividend declared	(4,420)					(4,420)
Ending balance, shares at Sep. 30, 2019		9,200,000	80,973,339	8,442,311
Ending balance at Sep. 30, 2019	2,307,979	$ 230,000	$ 810	$ (267,233)	907,022	1,493,765	(56,385)	0
Beginning balance, shares at Dec. 31, 2019		16,200,000	80,979,833	8,771,345
Beginning balance at Dec. 31, 2019	2,532,237	$ 405,000	$ 810	$ (278,510)	902,725	1,533,845	(31,633)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of preferred shares, net of offering expenses, shares		6,000,000
Issuance of preferred shares, net of offering expenses	144,829	$ 150,000			(5,171)
Share-based compensation, shares			184,644
Share-based compensation	1,605		$ 2		1,603
Treasury shares acquired, shares				1,365,620
Treasury shares acquired	(37,488)			$ (37,488)
Share repurchase to settle shareholder tax obligations, shares			(53,609)
Share repurchase to settle shareholder tax obligations	(2,156)		$ (1)		(2,155)
Net income (loss)	77,036					77,036
Other comprehensive income (loss)	(118,991)						(118,991)
Common shares dividend declared	(37,427)					(37,427)
Preferred shares dividend declared	(9,395)					(9,395)
Ending balance, shares at Mar. 31, 2020		22,200,000	81,110,868	10,136,965
Ending balance at Mar. 31, 2020	2,550,250	$ 555,000	$ 811	$ (315,998)	897,002	1,564,059	(150,624)	0
Beginning balance, shares at Dec. 31, 2019		16,200,000	80,979,833	8,771,345
Beginning balance at Dec. 31, 2019	2,532,237	$ 405,000	$ 810	$ (278,510)	902,725	1,533,845	(31,633)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares acquired, shares				3,773,252
Ending balance, shares at Sep. 30, 2020		22,200,000	81,151,723	12,544,597
Ending balance at Sep. 30, 2020	2,518,889	$ 555,000	$ 812	$ (385,696)	903,346	1,597,928	(152,501)	0
Beginning balance, shares at Mar. 31, 2020		22,200,000	81,110,868	10,136,965
Beginning balance at Mar. 31, 2020	2,550,250	$ 555,000	$ 811	$ (315,998)	897,002	1,564,059	(150,624)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of preferred shares, net of offering expenses, shares		0
Issuance of preferred shares, net of offering expenses	31	$ 0			31
Share-based compensation, shares			38,592
Share-based compensation	4,256				4,256
Treasury shares acquired, shares				2,050,924
Treasury shares acquired	(58,906)			$ (58,906)
Net income (loss)	70,588					70,588
Other comprehensive income (loss)	(10,373)						(10,373)
Common shares dividend declared	(36,383)					(36,383)
Preferred shares dividend declared	(10,513)					(10,513)
Ending balance, shares at Jun. 30, 2020		22,200,000	81,149,460	12,187,889
Ending balance at Jun. 30, 2020	2,508,950	$ 555,000	$ 811	$ (374,904)	901,289	1,587,751	(160,997)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of preferred shares, net of offering expenses	0
Share-based compensation, shares			2,263
Share-based compensation	2,058		$ 1		2,057
Treasury shares acquired, shares				356,708
Treasury shares acquired	(10,792)			$ (10,792)
Net income (loss)	56,458		56,458
Other comprehensive income (loss)	8,496						8,496
Common shares dividend declared	(35,769)		(35,769)
Preferred shares dividend declared	(10,512)		$ (10,512)
Ending balance, shares at Sep. 30, 2020		22,200,000	81,151,723	12,544,597
Ending balance at Sep. 30, 2020	$ 2,518,889	$ 555,000	$ 812	$ (385,696)	$ 903,346	$ 1,597,928	$ (152,501)	$ 0