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Restricted Cash and Short Term Deposits (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents $ 136,535,000 $ 188,289,000    
Less: Amounts included in current restricted cash and short-term deposits (75,106,000) (111,545,000) $ (252,843,000) $ (332,033,000)
Restricted cash (non-current portion) 61,429,000 76,744,000 $ 152,743,000 $ 154,393,000
Letter of Credit        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 75,912,000 75,968,000    
Lessor VIEs        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 39,987,000 34,947,000    
Interest Rate Swap        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 11,002,000 0    
Office lease        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 778,000 826,000    
Return Equity Swap        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 0 55,573,000    
Margin Loan facility | Line of Credit        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 2,004,000 10,000,000    
$1.125 billion facility | Interest-bearing Deposits        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 6,852,000 10,975,000    
Line of Credit | $1.125 billion facility | Secured Debt        
Restricted Cash and Cash Equivalents Items [Line Items]        
Line of credit facility, maximum borrowing capacity $ 1,125,000,000 $ 1,125,000,000