Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows From Operating Activities
Net loss	$ (33,863)	$ (2,471)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	8,249	6,690
Amortization of National Geographic fee	0	727
Amortization of deferred financing costs and other, net	687	486
Amortization of right-to-use lease assets	(3)	51
Stock-based compensation	1,611	898
Deferred income taxes	(2,801)	(1,828)
(Gain) loss on foreign currency	(70)	3,443
Changes in operating assets and liabilities
Marine operating supplies and inventories	(382)	(239)
Prepaid expenses and other current assets	(2,080)	2,339
Unearned passenger revenues	21,438	4,770
Other long-term assets	675	621
Other long-term liabilities	1,798	(4,411)
Accounts payable and accrued expenses	(2,179)	4,356
Net cash (used in) provided by operating activities	(6,920)	15,432
Cash Flows From Investing Activities
Purchases of property and equipment	(3,800)	(116,732)
Acquisition (net of cash acquired)	(6,872)	0
Net cash used in investing activities	(10,672)	(116,732)
Cash Flows From Financing Activities
Proceeds from long-term debt	0	152,695
Repayments of long-term debt	(500)	(500)
Payment of deferred financing costs	(31)	(61)
Repurchase under stock-based compensation plans and related tax impacts	(7)	(134)
Repurchase of warrants and common stock	0	(127)
Net cash (used in) provided by financing activities	(538)	151,873
Net (decrease) increase in cash, cash equivalents and restricted cash	(18,130)	50,573
Cash, cash equivalents and restricted cash at beginning of period	204,515	109,258
Cash, cash equivalents and restricted cash at end of period	186,385	159,831
Supplemental disclosures of cash flow information:
Interest	4,146	3,862
Income taxes	1	12
Non-cash investing and financing activities:
Non-cash preferred share dividend	1,301	0
Shares issued for acquisition	$ 1,770	$ 0