Condensed Consolidated Statements of Cash Flows (Unaduited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows From Operating Activities
Net income	$ 15,079	$ 10,917
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,188	5,045
Amortization of National Geographic fee	727	727
Amortization of deferred financing costs and other, net	434	608
Stock-based compensation	753	866
Deferred income taxes	(3,865)	347
(Gain) loss on foreign currency	(656)	451
Write-off of unamortized issuance costs related to debt refinancing		359
Changes in operating assets and liabilities
Marine operating supplies and inventories	(219)	(400)
Prepaid expenses and other current assets	(6,699)	(1,754)
Right-to-use lease assets	(6,027)
Lease liabilities	6,192
Unearned passenger revenues	6,016	(939)
Other long-term assets	(1,294)	10
Other long-term liabilities	825	8
Accounts payable and accrued expenses	(2,112)	(5,727)
Net cash provided by operating activities	15,342	10,518
Cash Flows From Investing Activities
Purchases of property and equipment	(35,144)	(14,502)
Net cash used in investing activities	(35,144)	(14,502)
Cash Flows From Financing Activities
Proceeds from long-term debt		200,000
Repayments of long-term debt	(500)	(170,625)
Payment of deferred financing costs	(18)	(6,297)
Repurchase under stock-based compensation plans and related tax impacts	(1,167)	(4,179)
Repurchase of warrants and common stock	(23)	(854)
Net cash (used in) provided by financing activities	(1,708)	18,045
Effect of exchange rate changes on cash		(40)
Net (decrease) increase in cash, cash equivalents and restricted cash	(21,510)	14,021
Cash, cash equivalents and restricted cash at beginning of period	122,150	103,500
Cash, cash equivalents and restricted cash at end of period	100,640	117,521
Supplemental disclosures of cash flow information:
Interest	3,377	3,012
Income taxes	23	45
Non-cash investing and financing activities:
Additional paid-in capital exercise proceeds of option shares		1,682
Additional paid-in capital exchange proceeds used for option shares		$ (1,682)