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Cash and cash equivalents: (Details) - MXN ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents
Cash and cash held at banks	$ 3,642,037	$ 3,743,212
Short term investments	2,550,642	841,295
Cash and cash equivalents	$ 6,192,679	$ 4,584,507	$ 4,677,454	$ 3,497,635

X

- Definition

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

+ 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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- References

No definition available.

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X

- Definition

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

+ References

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