Series F Preferred Stock [Member] Series F Preferred Stock [Member] Common Stock [Member] Common Stock [Member] Series I Preferred Stock [Member] Series I Preferred Stock [Member] Series I Preferred Stock Cover page. Cover page. Entities [Table] Entities [Table] Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Registrant Name Entity Registrant Name Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, Address Line One Entity Address, Address Line One Local Phone Number Local Phone Number Written Communications Written Communications Soliciting Material Soliciting Material Entity Address, State or Province Entity Address, State or Province Trading Symbol Trading Symbol Pre-commencement Tender Offer Pre-commencement Tender Offer Series J Preferred Stock [Member] Series J Preferred Stock [Member] Series J Preferred Stock Amendment Flag Amendment Flag Document Period End Date Document Period End Date Series G Preferred Stock [Member] Series G Preferred Stock [Member] Document Type Document Type City Area Code City Area Code Class of Stock [Domain] Class of Stock [Domain] Entity Emerging Growth Company Entity Emerging Growth Company Entity File Number Entity File Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, City or Town Entity Address, City or Town Series H Preferred Stock [Member] Series H Preferred Stock [Member] Entity Central Index Key Entity Central Index Key Entity Information [Line Items] Entity Information [Line Items] Title of 12(b) Security Title of 12(b) Security Class of Stock [Axis] Class of Stock [Axis]