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Investments in Trip Linhas Aereas ("TRIP") (Details) (USD $) | 9 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Jul. 12, 2012 Trip Linhas Aereas [Member] | Jul. 13, 2012 Trip Linhas Aereas [Member] item | Sep. 30, 2014 Trip Linhas Aereas [Member] | Jul. 13, 2012 Trip Investimentos Ltd | Sep. 30, 2014 Trip Investimentos Ltd
Investments in other companies |  |  |  |  |  |  |
Percentage ownership sold |  |  | 20.00% |  |  |  |
Proceeds received from sale of Trip Linhas Aereas stock | $ 17,237,000 | $ 16,658,000 |  | $ 42,000,000 |  |  |
Number of installments |  |  |  | 3 |  |  |
Option to acquire ownership (as a percent) |  |  |  |  |  | 15.38% |
Gain (loss) on equity method investments |  |  |  |  | 24,900,000 |  |
interest income received |  |  |  |  |  |  | $ 2,100,000

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