Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows From Operating Activities
Net loss	$ (92,894)	$ (69,929)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	25,785	23,728
Amortization of National Geographic fee	0	727
Amortization of deferred financing costs and other, net	2,364	1,549
Amortization of right-to-use lease assets	4	149
Stock-based compensation	4,146	1,911
Deferred income taxes	(2,648)	(7,710)
Loss on foreign currency	1,165	6,334
Changes in operating assets and liabilities
Marine operating supplies and inventories	(375)	589
Prepaid expenses and other current assets	(8,902)	6,320
Unearned passenger revenues	62,922	(18,362)
Other long-term assets	658	698
Other long-term liabilities	4,857	(4,949)
Accounts payable and accrued expenses	24,438	(12,794)
Net cash provided by (used in) operating activities	21,520	(71,739)
Cash Flows From Investing Activities
Purchases of property and equipment	(89,114)	(152,791)
Acquisition (net of cash acquired)	(7,177)	0
Net cash used in investing activities	(96,291)	(152,791)
Cash Flows From Financing Activities
Proceeds from long-term debt	61,720	183,339
Repayments of long-term debt	(1,530)	(1,500)
Payment of deferred financing costs	(3,135)	(4,877)
Repurchase under stock-based compensation plans and related tax impacts	(1,763)	(393)
Proceeds from Series A preferred stock issuance	0	85,000
Repurchase of warrants and common stock	0	(127)
Net cash provided by financing activities	55,292	261,442
Net (decrease) increase in cash, cash equivalents and restricted cash	(19,479)	36,912
Cash, cash equivalents and restricted cash at beginning of period	204,515	109,258
Cash, cash equivalents and restricted cash at end of period	185,036	146,170
Supplemental disclosures of cash flow information:
Interest	13,300	12,418
Income taxes	54	650
Non-cash investing and financing activities:
Non-cash preferred share dividend	3,962	0
Shares issued for acquisition	$ 1,770	$ 0