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Restricted Cash (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 106,677,000 $ 110,589,000
Restricted Stock [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 25,580,000 20,873,000
Restricted Stock [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 13,840,000 6,174,000
Restricted Stock [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 67,257,000 $ 83,542,000