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Long-Term Debt (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Feb. 13, 2020 USD ($)	Feb. 28, 2019 USD ($)	Mar. 31, 2020 USD ($) Aircraft	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Feb. 01, 2019 USD ($)
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year			$ 140,900
Long-term Debt, Maturities, Repayments of Principal in Year Two			185,800
Long-term Debt, Maturities, Repayments of Principal in Year Three			117,800
Long-term Debt, Maturities, Repayments of Principal in Year Four			105,000
Long-term Debt, Maturities, Repayments of Principal in Year Five			639,100
Long-term Debt, Maturities, Repayments of Principal after Year Five			$ 299,400
Line of Credit Facility, Fair Value of Amount Outstanding						$ 81,000
Number of Terms to be Included in the Collateral Pool			2 years
Debt Instrument, Face Amount	$ 545,500						$ 450,000
Debt Instrument, Increase (Decrease), Net	$ 100,000
Gain (Loss) on Extinguishment of Debt			$ 1,222	$ 3,677
Debt Instrument, Periodic Payment, Principal		$ 1,400
Long-term Debt [Member]
reduction in debt interest rate	150.00%
Senior Secured Revolving Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity					$ 81,000
Debt Instrument, Term					24 months
Senior Secured Revolving Credit Facility
Number Of Aircrafts Included As Collateral | Aircraft			8

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