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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

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