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Contingencies (Details)
$ in Thousands
1 Months Ended
Jul. 31, 2021
claim
May 31, 2021
claim
Sep. 30, 2021
USD ($)
claim
Dec. 31, 2020
USD ($)
Loss Contingencies [Line Items]        
Number of existing legal claims or proceedings that are likely to have a material effect on the Company's business     0  
Deferred Charges and Other Assets (includes $782 and $0 of restricted cash) | $     $ 156,912 $ 146,770
Maximum [Member]        
Loss Contingencies [Line Items]        
Loss contingency, estimate of possible loss | $     $ 15,000  
Education [Member] | Minimum [Member]        
Loss Contingencies [Line Items]        
Potential claims Per ED   800    
Claims received 1,400