Long-term Debt - Schedule of long term debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 236,045	$ 240,070
Less unamortized debt issuance costs	(6,377)	(6,655)
Total debt, net	229,668	233,415
Less current portion, net	(19,939)	(19,046)
Total long-term debt, net	209,729	214,369
Experience Vessel Financing
Debt Instrument [Line Items]
Total debt	145,400	148,500	$ 247,500
2017 Bank Loans
Debt Instrument [Line Items]
Total debt	$ 90,645	$ 91,570

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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