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Investments in Other Companies (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jul. 12, 2012 TRIP item | Sep. 30, 2013 TRIP | Jul. 12, 2012 TRIP Sale of interest item | Sep. 30, 2008 TRIP Common stock | Sep. 30, 2013 Trip Investimentos Ltda. item | Jul. 12, 2012 Trip Investimentos Ltda. Sale of interest Minimum | Jul. 12, 2012 Trip Investimentos Ltda. Sale of interest Maximum | Sep. 29, 2010 Air Mekong | Sep. 30, 2010 Air Mekong | Sep. 30, 2013 Air Mekong | Dec. 31, 2011 Air Mekong
Investments in other companies |  |  |  |  |  |  |  |  |  |  |
Percentage ownership acquired |  |  |  | 20.00% |  |  |  |  | 30.00% |  |
Company's investment balance |  | $ 19.1 |  |  |  |  |  |  |  |  |
Annual rate of return used to calculate the put option price (as a percent) |  | 5.00% |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment |  |  | 42.0 |  | 26.2 |  |  |  |  |  |
Number of installments | 3 |  | 3 |  |  |  |  |  |  |  |
Period of payment under the purchase agreement |  |  | 2 years |  |  |  |  |  |  |  |
Option to acquire ownership (as a percent) |  |  | 15.38% |  | 15.38% |  |  |  |  |  |
Option exercise period |  |  |  |  |  | 2 years | 4 years |  |  |  |
Number of installment payments received |  |  |  |  | 2 |  |  |  |  |  |
Third installment of equity interest sold |  |  |  |  | 16.8 |  |  |  |  |  |
Payments to acquire equity method investment |  |  |  |  |  |  |  | 7 |  |  | 3
Gain on sale of cost method investment |  |  |  |  |  |  |  |  |  | $ 5.0 |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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