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Assets Held for Sale (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2020
development_site
Oct. 08, 2019
Long Lived Assets Held-for-sale [Line Items]            
Equity method investment, ownership percentage           20.00%
Impairment charges | $ $ 7,306 $ 1,189 $ 7,306 $ 16,023    
GIC, Singapore Sovereign Wealth Fund | GIC            
Long Lived Assets Held-for-sale [Line Items]            
Equity method investment, ownership percentage           80.00%
Forecast            
Long Lived Assets Held-for-sale [Line Items]            
Equity method investment, ownership percentage         20.00%  
Number of development sites | development_site         3  
Forecast | GIC, Singapore Sovereign Wealth Fund | GIC            
Long Lived Assets Held-for-sale [Line Items]            
Equity method investment, ownership percentage         80.00%