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Restricted Cash and Short Term Deposits (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents $ 405,586,000 $ 486,426,000    
Less: Amounts included in current restricted cash and short-term deposits (252,843,000) (332,033,000) $ (276,289,000) $ (222,265,000)
Long-term restricted cash 152,743,000 154,393,000 $ 176,029,000 $ 175,550,000
Return Equity Swap        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 96,763,000 82,863,000    
Letter of Credit        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 151,957,000 174,597,000    
Lessor VIEs        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 114,976,000 176,428,000    
Office lease        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 786,000 777,000    
Bank guarantee        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 43,000 691,000    
Margin loan | Line of Credit        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 33,413,000 33,413,000    
$1.125 billion facility | Interest-bearing Deposits        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 7,648,000 17,657,000    
Secured Debt | Line of Credit | $1.125 billion facility        
Restricted Cash and Cash Equivalents Items [Line Items]        
Line of credit facility, maximum borrowing capacity $ 1,125,000,000 $ 1,125,000,000