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Letters of Credit	12 Months Ended
Letters of Credit	Dec. 31, 2013
Letters of Credit [Abstract]
Letters of Credit	Letters of Credit In connection with agreements with certain airports, the Company is required to post letters of credit, which totaled $0.2 million as of both December 31, 2013 and 2012. The issuing banks require that the Company deposit funds at those banks to cover the amounts that could be drawn under the letters of credit. These funds are generally invested in money market accounts and are classified as long-term assets within other long-term assets. Additionally, as of December 31, 2013, the Company had a $25.1 million unsecured standby letter of credit facility, representing an off balance-sheet commitment, of which $10.4 million had been drawn upon for issued letters of credit to airports and insurance underwriters.