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DEBT - REVOLVING CREDIT FACILITY (Details)			1 Months Ended				12 Months Ended
	Jan. 27, 2023 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Aug. 31, 2004 USD ($)	Sep. 30, 2003 USD ($)	Dec. 31, 2022 USD ($) item	Jun. 22, 2020 USD ($)	Apr. 27, 2020 USD ($)	Dec. 31, 2012 USD ($) item
Debt
Letters of credit							$ 7,900,000
MatNav
Debt
Annual principal payments	$ 14,300,000
Extinguishment of debt	$ 12,100,000
Standby commercial letters of credit
Debt
Used portion of revolving credit facility							7,900,000
Revolving Credit Facility
Debt
Ratio of debt instrument covenant threshold leverage		3.50
Ratio of debt instrument covenant threshold leverage connection with material acquisition		4.0
Fees paid		$ 2,200,000
Funds available under the revolving credit facility							$ 642,100,000
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)
Debt
Variable rate margin		1.00%
Revolving Credit Facility | Minimum | Base rate
Debt
Variable rate margin		0.00%
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)
Debt
Variable rate margin		1.75%
Revolving Credit Facility | Maximum | Base rate
Debt
Variable rate margin		0.75%
5.34 %, payable through 2028
Debt
Interest rate (as a percent)							5.34%
5.34 %, payable through 2028 | MatNav
Debt
Debt issued					$ 55,000,000.0	$ 55,000,000.0
Semi-annual payments						$ 1,100,000
Interest rate (as a percent)						5.34%
5.27 %, payable through 2029
Debt
Interest rate (as a percent)							5.27%
5.27 %, payable through 2029 | MatNav
Debt
Semi-annual payments					$ 1,100,000
Interest rate (as a percent)					5.27%
Unsecured Debt
Debt
Debt issued										$ 170,000,000.0
Number of tranches | item										3
Unsecured debt, tranche maturing in 2023
Debt
Debt issued										$ 77,500,000
Interest rate (as a percent)										3.66%
Unsecured debt, tranche maturing in 2027
Debt
Debt issued										$ 55,000,000.0
Interest rate (as a percent)										4.16%
Unsecured debt, tranche maturing in 2032
Debt
Debt issued										$ 37,500,000
Interest rate (as a percent)										4.31%
Senior Unsecured Series A Notes
Debt
Debt issued			$ 75,000,000
Debt instrument term			11 years
Interest rate (as a percent)			3.37%
Title XI Notes
Debt
The number of vessels committed to securing debt | item							2
Title XI Notes | MatNav
Debt
Debt issued								$ 139,600,000	$ 185,900,000
Interest rate (as a percent)								1.35%	1.22%
Debt instrument covenant ratio, maintenance of net worth							90.00%
Minimum working capital covenant							$ 1
Title XI Notes | MatNav | Minimum
Debt
Debt instrument covenant, long-term debt to net worth							2.00%
The Senior Unsecured Notes (The "Series D Notes")
Debt
Debt issued				$ 200,000,000.0
Debt instrument term				15 years
Interest rate (as a percent)				3.14%
Amendment to 2021 Private Placement Term Loan
Debt
Ratio of debt instrument covenant threshold leverage		3.50
Ratio of debt instrument covenant threshold leverage connection with material acquisition		4.0
Ratio of debt instrument threshold leverage to trigger interest enhancement payments		3.25
Fees paid		$ 800,000

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Debt instrument covenant, long-term debt to net worth.

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Threshold leverage ratio under the debt instrument covenant.

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Threshold leverage ratio in connection with material acquisition under the debt instrument covenant.

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Threshold leverage ratio to trigger interest enhancement payments under the debt instrument covenant.

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The number of vessels committed to securing debt.

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Represents the number of tranches in which the unsecured long-term debt funded.

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Amount of the total principal payments made during the annual reporting period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross amount of debt extinguished.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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