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Investments in Other Company (Details) (Air Mekong, USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2010 | Mar. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2012 | Aug. 31, 2010 CRJ 900 aircraft
Investment in Other Company |  |  |  |  |
Payments to acquire equity method investment | $ 7 |  | $ 3 |  |
Percentage ownership acquired | 30.00% |  |  |  |
Company's investment balance |  | 1.7 |  |  |
Voting ownership interest (as a percent) |  |  |  | 17.00% |
Number of aircraft subleased |  |  |  |  | 4
Other income recognized on termination of sub-lease with Air Mekong |  | $ 5.1 |  |  |

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