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Bank loans: (Details) $ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 COP ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 COP ($)
Credit line used |  | $ 14,493,049 |  |  |  |
Principle amortization | $ 2,851,120 | 4,000,000 |  |  |  |
Commissions and interest - Net | (5,599) | 1,804 |  |  |  |
Short Term | 175,515 | 173,471 |  |  |  |
Long-Term | 6,957,678 | 7,149,177,000 |  |  |  |
Fair value | 7,392,772 | 10,791,338 |  |  |  |
Airplan [Member] |  |  |  |  |  |
Credit line used | 3,223,712 | 3,641,929 |  | $ 428,997,468 |  | $ 440,000
Commissions and interest - Net | 6,732 | (8,925) |  |  |  |
Short Term | 172,784 | 144,289 |  |  |  |
Long-Term | 3,057,660 | 3,488,715 |  |  |  |
Fair value | 3,125,306 | 3,534,614 |  |  |  |
Mexico City [Member] |  |  |  |  |  |
Credit line used | 6,851,120 | 10,851,120 | $ 145 |  | $ 145 |
Principle amortization | 2,851,120 | 4,000,000 |  |  |  |
Commissions and interest - Net | (12,331) | 10,729 |  |  |  |
Short Term | 2,731 | 29,182 |  |  |  |
Long-Term | 3,984,938 | 6,832,667 |  |  |  |
Fair value | 4,267,466 | 7,256,724 |  |  |  |
BBVA Bancomer, S. A. [member] |  |  |  |  |  |
Credit line used |  |  |  |  | 72,500 |
Bank of America Merrill Lynch [member] |  |  |  |  |  |
Credit line used | 1,425,560 |  | 72,500 |  | $ 72,500 |
Principle amortization | 1,425,560 | 1,425,560 |  |  |  |
Commissions and interest - Net |  | 3,215 |  |  |  |
Short Term |  | 5,675 |  |  |  |
Long-Term |  | 1,423,100 |  |  |  |
Fair value |  | 1,535,374 |  |  |  |
Loan one from BBVA Bancomer [Member] |  |  |  |  |  |
Credit line used | 2,000,000 | 4,000,000 |  |  |  |
Principle amortization |  | 4,000,000 |  |  |  |
Commissions and interest - Net | (1,598) |  |  |  |  |
Short Term | 2,731 |  |  |  |  |
Long-Term | 1,995,671 |  |  |  |  |
Fair value | 2,135,210 |  |  |  |  |
Loan two from BBVA Bancomer [Member] |  |  |  |  |  |
Credit line used | 1,425,560 | 2,000,000 | $ 72,500 |  |  |
Principle amortization | 1,425,560 |  |  |  |  |
Commissions and interest - Net |  | (10,576) |  |  |  |
Short Term |  | 2,967 |  |  |  |
Long-Term |  | 1,986,467 |  |  |  |
Fair value |  | 2,091,065 |  |  |  |
Santander [Member] |  |  |  |  |  |
Credit line used | 2,000,000 | 2,000,000 |  |  |  |
Commissions and interest - Net |  | 14,875 |  |  |  |
Long-Term | 1,989,267 | 2,000,000 |  |  |  |
Fair value | 2,132,256 | 2,089,786 |  |  |  |
Loan three from BBVA Bancomer [Member] |  |  |  |  |  |
Credit line used |  | 1,425,560 |  |  |  |
Commissions and interest - Net |  | 3,215 |  |  |  |
Short Term |  | 5,675 |  |  |  |
Long-Term |  | 1,423,100 |  |  |  |
Fair value |  | 1,540,499 |  |  |  |
Bancolombia [Member] |  |  |  |  |  |
Credit line used | 1,099,078 | 1,295,381 |  | 146,250 |  | 150,000
Commissions and interest - Net | 2,656 | (2,595) |  |  |  |
Short Term | 58,958 | 103,100 |  |  |  |
Long-Term | 1,042,776 | 1,189,686 |  |  |  |
Fair value | 1,065,445 | 1,204,983 |  |  |  |
CorpBanca Columbia [Member] |  |  |  |  |  |
Credit line used | 747,684 | 813,757 |  | 99,450 |  | 102,000
Commissions and interest - Net | 2,947 | 633 |  |  |  |
Short Term | 40,030 | 2,840 |  |  |  |
Long-Term | 710,601 | 810,284 |  |  |  |
Fair value | 724,502 | 819,385 |  |  |  |
Banco Davivienda [Member] |  |  |  |  |  |
Credit line used | 659,584 | 718,021 |  | 87,750 |  | 90,000
Commissions and interest - Net | 2,064 | (1,159) |  |  |  |
Short Term | 35,317 | 2,488 |  |  |  |
Long-Term | 626,331 | 714,374 |  |  |  |
Fair value | 639,267 | 722,990 |  |  |  |
Banco de Occidente [Member] |  |  |  |  |  |
Credit line used | 270,970 | 295,187 |  | 36,074,228 |  | 37,000
Commissions and interest - Net | 135 | (1,258) |  |  |  |
Short Term | 14,527 | 1,031 |  |  |  |
Long-Term | 256,578 | 292,898 |  |  |  |
Fair value | 262,810 | 297,229 |  |  |  |
Banco Popular [Member] |  |  |  |  |  |
Credit line used | 58,389 | 63,824 |  | 7,799,030 |  | 8,000
Commissions and interest - Net | 580 | 941 |  |  |  |
Short Term | 3,275 | 369 |  |  |  |
Long-Term | 54,534 | 62,514 |  |  |  |
Fair value | 56,824 | 64,266 |  |  |  |
Banco AV Villas [Member] |  |  |  |  |  |
Credit line used | 58,642 | 63,824 |  | 7,800 |  |
Commissions and interest - Net | 233 | 49 |  |  |  |
Short Term | 3,141 | 223 |  |  |  |
Long-Term | 55,734 | 63,552 |  |  |  |
Fair value | 56,824 | 64,266 |  |  |  |
Serfinansa [Member] |  |  |  |  |  |
Credit line used | 58,393 | 63,824 |  | 7,800 |  | 8,000
Commissions and interest - Net | 867 | (1,243) |  |  |  |
Short Term | 3,008 | 79 |  |  |  |
Long-Term | 54,518 | 62,502 |  |  |  |
Fair value | 56,824 | 64,266 |  |  |  |
Banco de Bogota [Member] |  |  |  |  |  |
Credit line used | 270,972 |  |  | 36,074,210 |  | $ 37,000
Commissions and interest - Net | $ 144 | (1,047) |  |  |  |
Short Term |  | 34,159 |  | 14,528 |  |
Long-Term |  | 292,905 |  | 256,588 |  |
Fair value |  | $ 297,229 |  | $ 262,810 |  |

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