Commitments and Contingencies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) Aircraft
Types of Commercial Aircraft [Line Items]
Long-term Purchase Commitment, Minimum Quantity Required | Aircraft	25
Purchase Obligation, Future Minimum Payments, Remainder of Fiscal Year	$ 241,761
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required | Aircraft	36
Purchase Obligation, Due in Second Year	$ 170,253
Purchase Obligation, Due in Third Year	258,179
Purchase Obligation, Due in Fourth Year	293,756
Purchase Obligation, Due in Fifth Year	216,847
Purchase Obligation, Due after Fifth Year	142,193
Purchase Obligation	1,322,989
Pre-Delivery Payments [Member]
Types of Commercial Aircraft [Line Items]
Purchase Obligation	$ 140,717