Fair Value Measurements (Details Textual) $ in Thousands		12 Months Ended
	Apr. 10, 2019 USD ($) Aircraft	Dec. 31, 2019 USD ($) Aircraft	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net		$ 0
Net Book Value		7,375,018	$ 6,935,585
Impairment of aircraft		7,404	0	$ 80,430
Gain (Loss) on Disposition of Property Plant Equipment		$ 45,532	36,766	55,167
Fleet Review [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of Impaired Aircraft | Aircraft		0
Impairment of aircraft		$ 0
Maintenance revenue
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Revenue from contract with customer		$ 74,987	$ 105,738	$ 56,128
Jet Airways [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aircraft Leases Terminated | Aircraft	7
Jet Airways [Member] | Transactional
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Tangible Asset Impairment Charges	$ 7,404
Jet Airways [Member] | Maintenance revenue
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Revenue from contract with customer	$ 17,554