Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows From Operating Activities
Net loss	$ (28,195)	$ (40,876)	$ (108,160)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	52,562	46,711	44,042
Amortization of deferred financing costs and other, net	3,699	3,368	2,669
Amortization of right-to-use lease assets	893	811	608
Stock-based compensation	9,833	13,886	6,992
Deferred income taxes	2,052	2,719	5,481
Loss (gain) on foreign currency	1,065	(751)	1,236
Write-off of unamortized issuance costs related to debt refinancing	0	3,860	9,004
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(1,238)	(3,454)	(19,695)
Unearned passenger revenues	52,966	7,098	32,503
Other long-term assets	(2,037)	(1,871)	2,556
Other long-term liabilities	0	0	689
Accounts payable and accrued expenses	1,750	(5,210)	20,530
Operating lease liabilities	(995)	(850)	(658)
Net cash provided by (used in) operating activities	92,355	25,441	(2,203)
Cash Flows From Investing Activities
Purchases of property and equipment	(33,520)	(29,963)	(38,205)
Acquisition (net of cash acquired)	(10,559)	0	0
Sale of securities	0	15,163	(15,000)
Proceeds from loan principal repayment	0	0	3,610
Net cash used in investing activities	(44,079)	(14,800)	(49,595)
Cash Flows From Financing Activities
Purchase of redeemable noncontrolling interest	(16,721)	0	0
Proceeds from long-term debt	0	275,000	360,000
Repayments of long-term debt	(49)	(205,704)	(352,941)
Payment of deferred financing costs	(21)	(7,489)	(10,874)
Repurchase under stock-based compensation plans and related tax impacts	(2,974)	(1,128)	(1,056)
Net cash (used in) provided by financing activities	(19,765)	60,679	(4,871)
Effect of exchange rate changes on cash	288	0	0
Net increase in cash, cash equivalents and restricted cash	28,799	71,320	(56,669)
Cash, cash equivalents and restricted cash at beginning of period	187,344	116,024	172,693
Cash, cash equivalents and restricted cash at end of period	216,143	187,344	116,024
Supplemental disclosures of cash flow information:
Interest	49,423	43,695	25,815
Income taxes	319	711	309
Non-cash investing and financing activities:
Non-cash preferred stock dividend	4,641	4,373	4,671
Shares issued in connection with acquisition	6,000	0	0
Additional paid-in capital exercise proceeds of option shares	145	0	0
Additional paid-in capital exchange proceeds used for option shares	$ (145)	$ 0	$ 0