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Cash and cash equivalents: (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents:
Cash and cash held at banks	$ 3,514,293	$ 3,642,037
Short term investments	1,678,335	2,550,642
Cash and cash equivalents	$ 5,192,628	$ 6,192,679	$ 4,584,507	$ 4,677,454

X

- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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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

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No definition available.

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- Definition

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

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