Rental Income (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) aircraft	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Minimum future rentals on non-cancelable operating leases of flight equipment
2015 | $	$ 1,235,993
2016 | $	1,189,810
2017 | $	1,155,497
2018 | $	1,091,562
2019 | $	926,538
Thereafter | $	3,265,073
Total | $	8,864,473
Maintenance reserve revenue | $	$ 34,000	$ 25,200	$ 34,400
2015	6
2016	11
2017	10
2018	32
2019	39
Thereafter	142
Total	240
Airbus A319-100
Minimum future rentals on non-cancelable operating leases of flight equipment
2016	1
2017	1
Thereafter	1
Total	3
Airbus A320-200
Minimum future rentals on non-cancelable operating leases of flight equipment
2015	2
2016	2
2017	1
2018	4
2019	9
Thereafter	21
Total	39
Airbus A321-200
Minimum future rentals on non-cancelable operating leases of flight equipment
2015	1
2016	1
2017	1
2018	1
2019	1
Thereafter	21
Total	26
Airbus A330-200
Minimum future rentals on non-cancelable operating leases of flight equipment
2016	1
2018	4
2019	2
Thereafter	9
Total	16
Airbus A330-300
Minimum future rentals on non-cancelable operating leases of flight equipment
2019	1
Thereafter	4
Total	5
Boeing 737-700
Minimum future rentals on non-cancelable operating leases of flight equipment
2015	1
2017	2
2018	3
Thereafter	2
Total	8
Boeing 737-800
Minimum future rentals on non-cancelable operating leases of flight equipment
2015	1
2016	4
2017	5
2018	10
2019	10
Thereafter	49
Total	79
Boeing 767-300ER
Minimum future rentals on non-cancelable operating leases of flight equipment
2015	1
Total	1
Boeing 777-200ER
Minimum future rentals on non-cancelable operating leases of flight equipment
2019	1
Total	1
Boeing 777-300ER
Minimum future rentals on non-cancelable operating leases of flight equipment
2016	1
Thereafter	16
Total	17
Embraer E175
Minimum future rentals on non-cancelable operating leases of flight equipment
Thereafter	5
Total	5
Embraer E190
Minimum future rentals on non-cancelable operating leases of flight equipment
2016	1
2018	6
2019	10
Thereafter	4
Total	21
ATR 42/72-600
Minimum future rentals on non-cancelable operating leases of flight equipment
2018	4
2019	5
Thereafter	10
Total	19