Related-Party Transactions (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) aircraft	Dec. 31, 2012 aircraft	Dec. 31, 2014 USD ($)
Zions Bancorporation
Related Party Transactions
Cash balance with related party | $	$ 65,000,000		$ 90,600,000
Zions Bancorporation | Minimum
Related Party Transactions
Refinancing term		3 years
Zions Bancorporation | Maximum
Related Party Transactions
Refinancing term		4 years
Zions Bancorporation | CRJ 200
Related Party Transactions
Equity participation in leveraged leases on number of aircraft	1
Number of refinanced aircraft		5
Zions Bancorporation | CRJ 700
Related Party Transactions
Equity participation in leveraged leases on number of aircraft	2
Number of refinanced aircraft		2
Zions Bancorporation | Brasilia turboprop aircraft
Related Party Transactions
Equity participation in leveraged leases on number of aircraft	4
Affiliated Entity [Member] | ERJ 145
Related Party Transactions
Purchase from related party | $	$ 363,910