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Cash and cash equivalents (Details) $ in Thousands, $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2020 MXN ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 MXN ($)	Dec. 31, 2018 MXN ($)	Dec. 31, 2017 MXN ($)
Cash and cash equivalents
Short-term investments		$ 3,068,618		$ 3,231,125
Cash in banks		6,907,295		4,612,927
Cash on hand		36,432		44,880
Restricted funds held in trust related to debt service reserves		91,040		91,040
Total cash and cash equivalents	$ 506,468	$ 10,103,385	$ 400,025	$ 7,979,972	$ 5,862,942	$ 6,950,879

X

- Definition

The amount of cash balances held at banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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X

- Definition

The amount of cash held by the entity. This does not include demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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X

- Definition

The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

+ References

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- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

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