Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 28, 2019
Cover [Abstract]   
Entity Central Index Key0000766701  
Current Fiscal Year End Date--12-31  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Document Transition Reportfalse  
Document Annual Reporttrue  
Entity Shell Companyfalse  
Entity Small Businessfalse  
Entity Emerging Growth Companyfalse  
Entity Current Reporting StatusYes  
Entity Filer CategoryLarge Accelerated Filer  
Entity Public Float  $ 699,445,950
Entity Common Stock, Shares Outstanding 96,193,693 
Document Fiscal Year Focus2019  
Document Fiscal Period FocusFY  
Document Type10-K  
Amendment Flagfalse  
Document Period End DateDec. 31, 2019  
Entity Tax Identification Number75-2027937  
Entity File Number001-08896  
Entity Address, Address Line One8401 North Central Expressway  
Entity Address, Address Line TwoSuite 800  
Entity Address, City or TownDallas  
Entity Address, State or ProvinceTX  
Entity Address, Postal Zip Code75225-4404  
Entity Incorporation, State or Country CodeMD  
Entity Interactive Data CurrentYes  
City Area Code214  
Local Phone Number874-2323  
Documents Incorporated by Reference [Text Block]Portions of the Registrant’s definitive Proxy Statement, to be issued in connection with the 2020 Annual Meeting of Stockholders of the Registrant, are incorporated by reference into Part III.  
Common Stock [Member]   
Cover [Abstract]   
Trading SymbolCMO  
Security Exchange NameNYSE  
Title of 12(b) SecurityCommon Stock ($0.01 par value)  
Cumulative Redeemable Preferred Stock, Series E [Member]   
Cover [Abstract]   
Trading SymbolCMOPRE  
Security Exchange NameNYSE  
Title of 12(b) Security7.50% Series E Cumulative Redeemable       Preferred Stock ($0.10 par value)  

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