Commitments and Contingencies (Details) (USD $)	6 Months Ended
	Jun. 30, 2014 aircraft
Commitments and Contingencies
Number of aircraft leased by the entity	554
Future minimum rental payments required under operating leases
July through December 2014	$ 151,855,000
2015	342,342,000
2016	267,269,000
2017	197,603,000
2018	153,301,000
Thereafter	571,781,000
Total	1,684,151,000
E175
Agreements with other airlines
Number of aircraft delivered	8
Interim debt amount	187,400,000
E175 | Forecast
Agreements with other airlines
Refund of initial down payments	$ 34,000,000