Related Party Transactions - Aircraft Time Sharing Agreement (Details) - Verde Investments, Inc. - Air Transportation Equipment - Related Party $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) aircraft	Dec. 31, 2015 aircraft
Aircraft Time Sharing Agreement
Related Party Transaction [Line Items]
Number of aircrafts				2
Contractual term				12 months
Contractual agreement, perpetual automatic renewal term				12 months
Number of allowable days prior to contract termination with written notice				30 days
Expenses from transactions with related party | $	$ 0.5	$ 0.5	$ 0.4
Aircraft Time Sharing Agreement, Amended 2017
Related Party Transaction [Line Items]
Number of aircrafts			2