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Fair value measurement (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair value measurement |
Fair Value Assets Recurring and Nonrecurring | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ | ​ | ​ | ​ | Carrying | ​ | ​ | ​ | ​ | Carrying | ​ | ​ | ​
​ |  | Category |  | amount |  | Fair value |  | amount |  | Fair value
Fair values disclosed: |  |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash and cash equivalents |  | Level 1 | ​ | $ | 301,757 | ​ | $ | 301,757 | ​ | $ | 278,766 | ​ | $ | 278,766
Restricted cash |  | Level 1 | ​ |  | 140,966 | ​ |  | 140,966 | ​ |  | 28,129 | ​ |  | 28,129
Loan receivables | ​ | Level 2 | ​ | ​ | 8,355 | ​ | ​ | 8,849 | ​ | ​ | 5,798 | ​ | ​ | 6,438
Short-term debt |  | Level 2 | ​ |  | 35,213 | ​ |  | 35,213 | ​ |  | 29,145 | ​ |  | 29,145
Long-term debt | ​ | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Senior unsecured notes |  | Level 1 | ​ |  | 493,625 | ​ |  | 514,075 | ​ |  | 492,734 | ​ |  | 514,219
Term loan | ​ | Level 2 | ​ | ​ | 95,425 | ​ | ​ | 95,910 | ​ | ​ | 97,812 | ​ | ​ | 98,420
Long-term revolver loan |  | Level 2 | ​ |  | 47,439 | ​ |  | 47,506 | ​ |  | 46,102 | ​ |  | 46,184

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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