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Commitments and Contingencies (Insurance) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
General Liability  
Insurance  
Insurance maximum coverage per incident $ 300,000,000
Insurance maximum coverage per property 300,000,000
Disease Coverage  
Insurance  
Insurance maximum coverage per property 1,000,000
All Risk Property And Rental Value  
Insurance  
Insurance maximum coverage per incident 1,700,000,000
Terrorism Coverage Including NBCR  
Insurance  
Insurance maximum coverage per incident $ 1,700,000,000
Insurance coverage end date Dec. 01, 2027
Insurance maximum coverage in aggregate $ 1,700,000,000
NBCR  
Insurance  
Federal government responsibility (in percentage) 80.00%
FNSIC | NBCR  
Insurance  
Insurance deductible $ 275,000
Self insured responsibility (in percentage) 20.00%