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Fair value measurements (Carrying amounts and fair values of financial instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying value |  |  |
Assets |  |  |
Cash and cash equivalents |  | $ 1,659,669 | $ 2,035,447
Restricted cash |  | 364,456 | 329,180
Derivative assets |  | 48,896 | 37,187
Notes receivables |  | 22,497 | 23,359
Assets, Fair value |  | 2,095,518 | 2,425,173
Liabilities |  |  |
Debt | [1] | 28,580,800 | 27,873,900
Guarantees |  | 2,272 | 51,804
Liabilities, Fair value |  | 28,583,072 | 27,925,704
Fair value |  |  |
Assets |  |  |
Cash and cash equivalents |  | 1,659,669 | 2,035,447
Restricted cash |  | 364,456 | 329,180
Derivative assets |  | 48,896 | 37,187
Notes receivables |  | 22,497 | 23,359
Assets, Fair value |  | 2,095,518 | 2,425,173
Liabilities |  |  |
Debt |  | 29,074,375 | 28,203,635
Guarantees |  | 2,272 | 51,804
Liabilities, Fair value |  | 29,076,647 | 28,255,439
Fair value | Level 1 |  |  |
Assets |  |  |
Cash and cash equivalents |  | 1,659,669 | 2,035,447
Restricted cash |  | 364,456 | 329,180
Derivative assets |  | 0 | 0
Notes receivables |  | 0 | 0
Assets, Fair value |  | 2,024,125 | 2,364,627
Liabilities |  |  |
Debt |  | 0 | 0
Guarantees |  | 0 | 0
Liabilities, Fair value |  | 0 | 0
Fair value | Level 2 |  |  |
Assets |  |  |
Cash and cash equivalents |  | 0 | 0
Restricted cash |  | 0 | 0
Derivative assets |  | 48,896 | 37,187
Notes receivables |  | 22,497 | 23,359
Assets, Fair value |  | 71,393 | 60,546
Liabilities |  |  |
Debt |  | 29,074,375 | 28,203,635
Guarantees |  | 0 | 0
Liabilities, Fair value |  | 29,074,375 | 28,203,635
Fair value | Level 3 |  |  |
Assets |  |  |
Cash and cash equivalents |  | 0 | 0
Restricted cash |  | 0 | 0
Derivative assets |  | 0 | 0
Notes receivables |  | 0 | 0
Assets, Fair value |  | 0 | 0
Liabilities |  |  |
Debt |  | 0 | 0
Guarantees |  | 2,272 | 51,804
Liabilities, Fair value |  | $ 2,272 | $ 51,804
[1] | Excludes debt issuance costs and debt discounts.

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- Definition Restricted Cash And Cash Equivalents, Fair Value Disclosure + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248 + Details
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