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