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Bank loans: (Details) $ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 COP ($) | Dec. 31, 2016 USD ($)
Credit line used | $ 14,493,049 | $ 4,433,170 |  |  | $ 215,000
Principle amortization | 4,000,000 |  |  |  |
Commissions and interest - Net | 1,804 | 27,606 |  |  |
Short Term | 173,471 | 58,336 |  |  |
Long Term | 7,149,177 |  |  |  |
Fair value | 10,791,338 | 4,765,630 |  |  |
Airplan [Member] |  |  |  |  |
Credit line used | 3,641,929 |  |  | $ 440,000,000 |
Commissions and interest - Net | (8,925) |  |  |  |
Short Term | 144,289 |  |  |  |
Long Term | 3,488,715 |  |  |  |
Fair value | 3,534,614 |  |  |  |
BBVA Bancomer, S. A. [member] |  |  |  |  |
Credit line used |  | 2,216,585 |  |  | 107,500
Principle amortization |  |  |  |  |
Commissions and interest - Net |  | 13,803 |  |  |
Short Term |  | 29,168 |  |  |
Long Term |  | 2,201,220 |  |  |
Fair value |  | 2,387,179 |  |  |
Bank of America Merrill Lynch [member] |  |  |  |  |
Credit line used | 1,425,560 | 2,216,585 | $ 72,500 |  | $ 107,500
Principle amortization |  |  |  |  |
Commissions and interest - Net | 3,215 | 13,803 |  |  |
Short Term | 5,675 | 29,168 |  |  |
Long Term | 1,423,100 | 2,201,220 |  |  |
Fair value | 1,535,374 | $ 2,378,451 |  |  |
Loan one from BBVA Bancomer [Member] |  |  |  |  |
Credit line used | 2,000,000 |  |  |  |
Commissions and interest - Net | 14,875 |  |  |  |
Short Term | 14,875 |  |  |  |
Long Term | 2,000,000 |  |  |  |
Fair value | 2,089,786 |  |  |  |
Loan two from BBVA Bancomer [Member] |  |  |  |  |
Credit line used | 4,000,000 |  |  |  |
Principle amortization | 4,000,000 |  |  |  |
Santander [Member] |  |  |  |  |
Credit line used | 2,000,000 |  |  |  |
Commissions and interest - Net | (10,576) |  |  |  |
Short Term | 2,957 |  |  |  |
Long Term | 1,986,467 |  |  |  |
Fair value | 2,091,065 |  |  |  |
Loan three from BBVA Bancomer [Member] |  |  |  |  |
Credit line used | 1,425,560 |  | $ 72,500 |  |
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 | 1,295,381 |  |  | 150,000,000 |
Commissions and interest - Net | (2,595) |  |  |  |
Short Term | 103,100 |  |  |  |
Long Term | 1,189,686 |  |  |  |
Fair value | 1,204,983 |  |  |  |
CorpBanca [Member] |  |  |  |  |
Credit line used | 718,021 |  |  | 102,000,000 |
Commissions and interest - Net | (633) |  |  |  |
Short Term | 2,840 |  |  |  |
Long Term | 810,284 |  |  |  |
Fair value | 819,389 |  |  |  |
Banco Davivienda [Member] |  |  |  |  |
Credit line used | 328,112 |  |  | 90,000,000 |
Commissions and interest - Net | (1,159) |  |  |  |
Short Term | 2,488 |  |  |  |
Long Term | 292,905 |  |  |  |
Fair value | 722,990 |  |  |  |
Banco de Occidente [Member] |  |  |  |  |
Credit line used | 295,186 |  |  | 37,000,000 |
Commissions and interest - Net | (1,258) |  |  |  |
Short Term | 1,031 |  |  |  |
Long Term | 292,898 |  |  |  |
Fair value | 297,229 |  |  |  |
Banco Popular [Member] |  |  |  |  |
Credit line used | 63,824 |  |  | 8,000,000 |
Commissions and interest - Net | (941) |  |  |  |
Short Term | 369 |  |  |  |
Long Term | 62,514 |  |  |  |
Fair value | 64,266 |  |  |  |
Banco AV Villas [Member] |  |  |  |  |
Credit line used | 63,824 |  |  | 8,000,000 |
Commissions and interest - Net | (49) |  |  |  |
Short Term | 223 |  |  |  |
Long Term | 63,552 |  |  |  |
Fair value | 64,266 |  |  |  |
Serfinansa [Member] |  |  |  |  |
Credit line used | 63,824 |  |  | 8,000,000 |
Commissions and interest - Net | (1,243) |  |  |  |
Short Term | 79 |  |  |  |
Long Term | 62,502 |  |  |  |
Fair value | 64,266 |  |  |  |
Loan from Banco Bogota [Member] | Airplan [Member] |  |  |  |  |
Credit line used | 813,757 |  |  | $ 37,000,000 |
Commissions and interest - Net | (1,047) |  |  |  |
Short Term | 34,159 |  |  |  |
Long Term | 714,374 |  |  |  |
Fair value | $ 297,229 |  |  |  |

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