Condensed Consolidated Statements of Cash Flows (Unaudited)) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows From Operating Activities
Net (loss) income	$ (69,929)	$ 18,656
Adjustments to reconcile net (loss) income to net cash (used by) provided by operating activities:
Depreciation and amortization	23,728	18,603
Amortization of National Geographic fee	727	2,181
Amortization of deferred financing costs and other, net	1,549	1,392
Amortization of right-to-use lease assets	149	217
Stock-based compensation	1,911	2,671
Deferred income taxes	(7,710)	4,177
Loss on foreign currency	6,334	1,181
Changes in operating assets and liabilities
Marine operating supplies and inventories	589	(620)
Prepaid expenses and other current assets	6,320	(2,780)
Unearned passenger revenues	(18,362)	1,116
Other long-term assets	698	(7,561)
Other long-term liabilities	(4,949)	4,530
Accounts payable and accrued expenses	(12,794)	(2,213)
Net cash (used in) provided by operating activities	(71,739)	41,550
Cash Flows From Investing Activities
Purchases of property and equipment	(152,791)	(76,720)
Net cash used in investing activities	(152,791)	(76,720)
Cash Flows From Financing Activities
Proceeds from long-term debt	183,339	30,476
Proceeds from Series A preferred stock issuance	85,000	0
Repayments of long-term debt	(1,500)	(1,500)
Payment of deferred financing costs	(4,877)	(2,340)
Repurchase under stock-based compensation plans and related tax impacts	(393)	(1,778)
Repurchase of warrants and common stock	(127)	(23)
Warrants exercised	0	314
Net cash provided by financing activities	261,442	25,149
Net increase (decrease) in cash, cash equivalents and restricted cash	36,912	(10,021)
Cash, cash equivalents and restricted cash at beginning of period	109,258	122,151
Cash, cash equivalents and restricted cash at end of period	146,170	112,130
Supplemental disclosures of cash flow information:
Interest	12,418	10,651
Income taxes	650	1,893
Non-cash investing and financing activities:
Additional paid-in capital exercise proceeds of option shares	0	225
Additional paid-in capital exchange proceeds used for option shares	0	(225)
Non-cash deemed dividend to warrant holders	$ 0	$ 2,654