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Fair Value - Nonrecurring Fair Value (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Operating real estate, net $ 1,448,040   $ 1,483,930
Assets held for sale 0   5,000
Impairment loss 800 $ 91,400  
Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Operating real estate, net 1,900   234,650
Assets held for sale 0   5,000
Nonrecurring | Level 3 | Operating Real Estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss 786   164,215
Nonrecurring | Level 3 | Assets Held-For-Sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss $ 0   $ 1,753