Annual report pursuant to Section 13 and 15(d)

Disposition of Property (Details)

v3.19.3.a.u2
Disposition of Property (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
ft²
Dec. 31, 2017
USD ($)
ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Square Feet | ft²   878,000  
Net Sales Price   $ 128,505,000  
Gain on sale of assets   $ 43,422,000  
Nags Head, Ocean City, Park City & Williamsburg [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Square Feet | ft²   878,000  
Net Sales Price   $ 128,248,000  
Gain on sale of assets $ 43,400,000 $ 43,422,000  
Land outparcel [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Square Feet | ft²   0  
Net Sales Price   $ 257,000  
Gain on sale of assets   $ 0  
Westbrook [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Square Feet | ft²     290,000
Net Sales Price     $ 39,213,000
Gain on sale of assets     $ 6,943,000