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Restricted cash and short term deposits Restricted cash and short-term deposits, composition (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents $ 457,776,000 $ 397,815,000    
Restricted cash and cash equivalents, current (302,456,000) (222,265,000) $ (270,087,000) $ (183,693,000)
Restricted cash (non-current portion) 155,320,000 175,550,000 $ 182,416,000 $ 232,335,000
Return Equity Swap        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 69,382,000 58,351,000    
Letter of Credit        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 175,482,000 174,737,000    
Lessor VIEs        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 188,434,000 130,063,000    
Office lease        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 818,000 813,000    
Bank guarantee        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 674,000 99,000    
$1.125 billion facility | Interest-bearing Deposits        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 22,986,000 33,752,000    
Line of Credit | Secured Debt | $1.125 billion facility        
Restricted Cash and Cash Equivalents Items [Line Items]        
Maximum borrowing capacity $ 1,125,000,000 $ 1,125,000,000