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ACCRUED AND OTHER LIABILITIES - Reserve for Tenant Improvements and Environmental Reserves (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
a
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
a
Mar. 31, 2021
a
Environmental reserves            
Tenant improvement allowances and leasing commissions $ 6.7          
Area of land (in acres) | a 4,750         25,000
Environmental Reserve for Monitoring Environmental Remediation Work Previously Performed            
Environmental reserves            
Additional environmental reserve accrued     $ 0.7 $ 0.5 $ 0.1  
Environmental costs funded $ 0.6          
Environmental reserve accrued 0.1          
Environmental Reserve for Monitoring Environmental Remediation Work Previously Performed | Minimum            
Environmental reserves            
Additional environmental reserve accrued   $ 0.1        
Estimated cost       0.5    
Environmental Reserve for Monitoring Environmental Remediation Work Previously Performed | Maximum            
Environmental reserves            
Area of land (in acres) | a         1  
Estimated cost       $ 1.0    
Income Property, Multi-tenant, Shops at Legacy, Plano, Texas            
Environmental reserves            
Payment of tenant improvement allowances and leasing commissions 1.6          
Remaining reserve for tenant improvements $ 5.1