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Restricted cash and short term deposits Restricted cash and short-term deposits, composition (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 452,318,000	$ 397,815,000
Restricted cash and cash equivalents, current	(276,289,000)	(222,265,000)	$ (205,227,000)	$ (183,693,000)
Restricted cash	176,029,000	175,550,000	$ 233,144,000	$ 232,335,000
Return Equity Swap
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	62,547,000	58,351,000
Letter of Credit
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	175,206,000	174,737,000
Lessor VIEs
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	185,673,000	130,063,000
Office lease
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	823,000	813,000
Bank guarantee
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	685,000	99,000
$1.125 billion facility | Interest-bearing Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	27,384,000	33,752,000
Secured Debt | Line of Credit | $1.125 billion facility
Restricted Cash and Cash Equivalents Items [Line Items]
Maximum borrowing capacity	$ 1,125,000,000	$ 1,125,000,000

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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