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Investment in Other Companies (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 12 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 TRIP | Jul. 31, 2012 TRIP Sale of interest Y | Jun. 30, 2012 TRIP Preferred stock | Sep. 30, 2008 TRIP Common stock | Jul. 31, 2012 Trip Investimentos Ltda. Sale of interest | Jul. 31, 2012 Trip Investimentos Ltda. Sale of interest Minimum Y | Jul. 31, 2012 Trip Investimentos Ltda. Sale of interest Maximum Y | Sep. 30, 2010 Air Mekong | Dec. 31, 2011 Air Mekong | Jun. 30, 2012 Air Mekong | Jun. 30, 2012 Trip and Air Mekong
Investment in Other Companies |  |  |  |  |  |  |  |  |  |  |
Percentage ownership acquired |  |  | 6.00% | 20.00% |  |  |  | 30.00% |  |  |
Company's investment balance | $ 24.1 |  |  |  |  |  |  |  |  | $ 2.1 |
Voting ownership interest (as a percent) | 20.00% |  |  |  |  |  |  |  |  |  |
The annual rate of return used to calculate the put option price (as a percent) | 5.00% |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment |  | 42 |  |  |  |  |  |  |  |  |
Number of installments |  | 3 |  |  |  |  |  |  |  |  |
Period of payment under purchase agreement (in years) |  | 2 |  |  |  |  |  |  |  |  |
Option to acquire ownership (as a percent) |  |  |  |  | 15.38% |  |  |  |  |  |
Option exercise period (in years) |  |  |  |  |  | 4 | 6 |  |  |  |
Payments to acquire equity method investment |  |  |  |  |  |  |  | 7 | 3 |  |
Company's portion of the losses attributable to its investments |  |  |  |  |  |  |  |  |  |  | $ 5.3

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