Debt and Other Obligations - Narrative (Details)			3 Months Ended					6 Months Ended
	Apr. 30, 2021 USD ($) day $ / shares shares	May 12, 2020 USD ($) day	Jun. 30, 2024 USD ($) $ / shares shares	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($) aircraft	Mar. 31, 2024 USD ($) aircraftLeasebackTransaction	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($)	Mar. 31, 2024 aircraft	Mar. 31, 2024 aircraftLeasebackTransaction	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Derivative liability				$ 8,204,000				$ 8,200,000
Total			$ 3,123,600,000					3,123,600,000				$ 3,054,800,000
Less unamortized discounts, net			52,700,000					52,700,000				69,000,000.0
Repayments of long-term debt			72,800,000				$ 112,400,000	119,600,000	$ 241,800,000
Gain on extinguishment of debt			0				$ 0	14,996,000	$ 0
Current maturities of long-term debt, net, and finance leases			$ 142,815,000					$ 142,815,000				$ 315,580,000
Aircraft Leaseback Transaction
Debt Instrument [Line Items]
Additional sale-leaseback transaction					5	5
Number of aircraft on leases					2	2
Failed aircraft sale leaseback										3	3
Current maturities of long-term debt, net, and finance leases				123,500,000	$ 123,500,000	$ 123,500,000
Fixed Rate Loans
Debt Instrument [Line Items]
Extinguishment of debt				139,600,000
Sale leaseback transaction, number of aircraft related to loans | aircraft										5
Gain on extinguishment of debt				$ 15,000,000
Convertible notes due 2025 | Convertible Notes
Debt Instrument [Line Items]
Principal amount		$ 175,000,000
Stated interest rate percentage		4.75%	4.75%					4.75%				4.75%
Convertible debt, conversion price threshold		130.00%
Number of trading days required for conversion price threshold | day		20
Number of consecutive days required for trading days for conversion price threshold | day		30
Number of consecutive business days for conversion price threshold | day		5
Number of consecutive trading days measurement period | day		5
Trading price threshold per principal amount portion		98.00%
Shares conversion rate per portion of principal amount (in shares) | shares			97.5929					97.5929
Principal amount portion for trading price threshold		$ 1,000	$ 1,000					$ 1,000
Conversion price (in dollars per share) | $ / shares			$ 10.25					$ 10.25
1.00% convertible notes due 2026 | Convertible Notes
Debt Instrument [Line Items]
Principal amount	$ 500,000,000.0
Stated interest rate percentage	1.00%		1.00%					1.00%				1.00%
Convertible debt, conversion price threshold	130.00%
Number of trading days required for conversion price threshold | day	20
Number of consecutive days required for trading days for conversion price threshold | day	30
Number of consecutive business days for conversion price threshold | day	5
Trading price threshold per principal amount portion	98.00%
Shares conversion rate per portion of principal amount (in shares) | shares	20.3791		25.3578					25.3578
Principal amount portion for trading price threshold	$ 1,000		$ 1,000					$ 1,000
Conversion price (in dollars per share) | $ / shares	$ 49.07		$ 39.44					$ 39.44
Number of trading days before maturity redemption allowed | day	40
Total			$ 478,400,000					$ 478,400,000
Less unamortized discounts, net			21,600,000					21,600,000
Revolving credit facilities | Revolving credit facility due in 2025 | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity			$ 300,000,000					$ 300,000,000				$ 300,000,000