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Fair Values - Schedule of Fair Value Measurement (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
land_asset
real_estate_asset
Recurring basis | Fair Value    
Assets and liabilities recorded at fair value    
Derivative Assets $ 2,279 $ 3,669
Derivative liabilities 14,297 10,244
Available-for-sale securities 22,615 21,661
Recurring basis | Level 1    
Assets and liabilities recorded at fair value    
Derivative Assets 0 0
Derivative liabilities 0 0
Available-for-sale securities 0 0
Recurring basis | Level 2    
Assets and liabilities recorded at fair value    
Derivative Assets 2,279 3,669
Derivative liabilities 14,297 10,244
Available-for-sale securities 0 0
Recurring basis | Level 3    
Assets and liabilities recorded at fair value    
Derivative Assets 0 0
Derivative liabilities 0 0
Available-for-sale securities 22,615 21,661
Non-recurring basis    
Assets and liabilities recorded at fair value    
Impaired real estate, aggregate impairment   $ 76,300
Impaired real estate, number of assets | real_estate_asset   3
Impaired real estate available and held for sale, aggregate impairment 3,200 $ 3,700
Impaired real estate available and held for sale, number of assets | real_estate_asset   2
Impaired land and development, aggregate impairment   $ 55,400
Impaired land and development, number of assets | land_asset   4
Non-recurring basis | Fair Value    
Assets and liabilities recorded at fair value    
Impaired real estate   $ 29,400
Impaired real estate available and held for sale 17,100 19,300
Impaired land and development   78,400
Non-recurring basis | Level 1    
Assets and liabilities recorded at fair value    
Impaired real estate   0
Impaired real estate available and held for sale 0 0
Impaired land and development   0
Non-recurring basis | Level 2    
Assets and liabilities recorded at fair value    
Impaired real estate   0
Impaired real estate available and held for sale 0 0
Impaired land and development   0
Non-recurring basis | Level 3    
Assets and liabilities recorded at fair value    
Impaired real estate   29,400
Impaired real estate available and held for sale $ 17,100 19,300
Impaired land and development   78,400
Non-recurring basis | Commercial operating property one    
Assets and liabilities recorded at fair value    
Impaired real estate, aggregate impairment   23,200
Non-recurring basis | Property to be sold    
Assets and liabilities recorded at fair value    
Impaired real estate, aggregate impairment   6,000
Non-recurring basis | Commercial operating property two    
Assets and liabilities recorded at fair value    
Impaired real estate, aggregate impairment   47,100
Non-recurring basis | Waterfront land and development asset to be sold    
Assets and liabilities recorded at fair value    
Impaired land and development, aggregate impairment   25,000
Non-recurring basis | Master planned community    
Assets and liabilities recorded at fair value    
Impaired land and development, aggregate impairment   21,600
Non-recurring basis | Infill land and development asset    
Assets and liabilities recorded at fair value    
Impaired land and development, aggregate impairment   6,900
Non-recurring basis | Waterfront land and development asset sold    
Assets and liabilities recorded at fair value    
Impaired land and development, aggregate impairment   $ 1,900