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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows From Operating Activities      
Net income (loss) $ 11,552 $ (7,529) $ 5,059
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 20,768 17,351 18,420
Amortization of National Geographic fee 2,907 2,907 2,907
Amortization of deferred financing costs and other, net 1,909 2,226 1,144
Stock-based compensation 4,405 10,627 5,411
Deferred income taxes 343 8,336 (3,326)
Loss (gain) on foreign currency 2,175 (1,144) 720
Write-off of unamortized issuance costs related to debt refinancing 359
Loss on write-off of assets 129
Loss on disposal and transfer of assets 819
Changes in operating assets and liabilities      
Marine operating supplies and inventories 70 (1,036) 1,073
Prepaid expenses and other current assets (716) 575 629
Unearned passenger revenues 11,134 20,709 245
Other long-term assets (698) 136 (3,642)
Other long-term liabilities (129) 3 4
Accounts payable and accrued expenses 2,149 (243) 1,964
Net cash provided by operating activities 56,357 52,918 31,427
Cash Flows From Investing Activities      
Purchases of property and equipment (54,345) (80,485) (75,933)
Acquisition of Natural Habitat, Inc., net of $4,904 cash acquired (9,946)
Net cash used in investing activities (54,345) (80,485) (85,879)
Cash Flows From Financing Activities      
Proceeds from long-term debt 200,000
Repayments of long-term debt (171,625) (1,750) (1,750)
Payment of deferred financing costs (6,490) (418) (1,565)
Repurchase under stock-based compensation plans and related tax impacts (4,510) (5,034) (2,694)
Repurchase of warrants and common stock (854) (6,192) (10,343)
Net cash provided by (used in) financing activities 16,521 (13,394) (16,352)
Effect of exchange rate changes on cash 118 30 (128)
Net increase (decrease) in cash, cash equivalents and restricted cash 18,651 (40,931) (70,932)
Cash, cash equivalents and restricted cash at beginning of period 103,500 144,431 205,363
Cash, cash equivalents and restricted cash at end of period 122,151 103,500 144,431
Supplemental disclosures of cash flow information:      
Interest 13,391 10,478 9,896
Income taxes 522 965 998
Non-cash investing and financing activities:      
Additional paid-in capital exercise proceeds of option shares 1,682 1,682 1,123
Additional paid-in capital exchange proceeds used for option shares $ (1,682) $ (1,682) $ (1,123)