Class of Stock [Domain] Class of Stock [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entities [Table] Entities [Table] Class of Stock [Axis] Class of Stock [Axis] Security Exchange Name Security Exchange Name Entity Address, City or Town Entity Address, City or Town Soliciting Material Soliciting Material Cover [Abstract] Cover [Abstract] City Area Code City Area Code Amendment Flag Amendment Flag Entity Tax Identification Number Entity Tax Identification Number Class B, Series 4 Preferred Stock [Member] Class B, Series 4 Preferred Stock [Member] Class B, Series 4 Preferred Stock [Member] 8% Preferred Stock [Member] 8% Preferred Stock [Member] CHS 8% Preferred Stock [Member] Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Pre-commencement Tender Offer Pre-commencement Tender Offer Class B, Series 2 Preferred Stock [Member] Class B, Series 2 Preferred Stock [Member] Class B, Series 2 Preferred Stock [Member] Entity Emerging Growth Company Entity Emerging Growth Company Entity Central Index Key Entity Central Index Key Class B, Series 1 Preferred Stock [Member] Class B, Series 1 Preferred Stock [Member] Class B, Series 1 Preferred Stock [Member] Entity File Number Entity File Number Entity Address, State or Province Entity Address, State or Province Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, Address Line One Entity Address, Address Line One Entity Address, Postal Zip Code Entity Address, Postal Zip Code Written Communications Written Communications Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Document Period End Date Document Period End Date Entity Information [Line Items] Entity Information [Line Items] Document Type Document Type Class B, Series 3 Preferred Stock [Member] Class B, Series 3 Preferred Stock [Member] Class B, Series 3 Preferred Stock [Member]