Threshold leverage ratio under the debt instrument covenant.

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Amount of semi-annual principal payments that the company has to pay after year five since the first year of maturity payment as stated in the agreement.

+ References

No definition available.

+ Details

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- Definition

Amount of semi-annual principal payments that the company has to pay in the year one as stated in the agreement.

+ References

No definition available.

+ Details

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- Definition

Amount of semi-annual principal payments that the company has to pay in year two to year five since the first year of maturity payment as stated in the agreement.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Period Type:	instant

- Definition

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

+ References

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+ Details

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Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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

+ References

+ Details

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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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DEBT - PRIVATE PLACEMENT TERM LOANS (Details) $ in Thousands						1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($)	Jun. 22, 2020 USD ($)	Apr. 27, 2020 USD ($)	Dec. 21, 2016 USD ($)	Sep. 14, 2016 USD ($)	Aug. 31, 2004 USD ($)	Sep. 30, 2003 USD ($)	Jun. 30, 2012 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)
Debt
Proceeds from issuance of debt									$ 325,500
Letters of credit										$ 8,000
5.34 %, payable through 2028
Debt
Interest rate (as a percent)										5.34%
5.34 %, payable through 2028 \| MatNav
Debt
Debt issued							$ 55,000
Semi-annual payments							$ 1,100
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
Debt issued						$ 55,000
Semi-annual payments						$ 1,100
Interest rate (as a percent)						5.27%
Unsecured Debt
Debt
Debt issued								$ 170,000
Number of tranches \| item								3
Unsecured Debt \| Debt instrument redemption 2017 through mid-year 2023
Debt
Semi-annual payments								$ 4,600
Unsecured Debt \| Debt instrument redemption mid-year 2023 through mid-year 2027
Debt
Semi-annual payments								8,400
Unsecured Debt \| Debt instrument redemption after mid-year 2027
Debt
Semi-annual payments								3,800
Unsecured Debt \| Debt Instrument Redemption After mid-year 2027
Debt
Semi-annual payments								1,200
Unsecured debt, tranche maturing in 2023
Debt
Debt issued								$ 77,500
Interest rate (as a percent)								3.66%
Unsecured debt, tranche maturing in 2027
Debt
Debt issued								$ 55,000
Interest rate (as a percent)								4.16%
Unsecured debt, tranche maturing in 2032
Debt
Debt issued								$ 37,500
Interest rate (as a percent)								4.31%
Senior Unsecured Series A Notes
Debt
Debt issued				$ 75,000
Debt instrument term				11 years
Interest rate (as a percent)				3.37%
Senior Unsecured Series A Notes \| Debt Instrument Redemption Period One [Member]
Debt
Semi-annual payments				$ 5,800
Senior Unsecured Series A Notes \| Debt Instrument Redemption 2022 through 2027
Debt
Semi-annual payments				$ 11,500
Title XI Notes \| MatNav
Debt
Debt issued		$ 139,600	$ 185,900
Annual principal payments		3,000	4,000
Payment of debt financing costs		$ 6,700	$ 8,700
Interest rate (as a percent)		1.35%	1.22%
The Senior Unsecured Notes (The "Series D Notes")
Debt
Debt issued					$ 200,000
Debt instrument term					15 years
Interest rate (as a percent)					3.14%
Maturities of Long-term Debt
Semi-annual principal payments in year 2019					$ 6,000
Semi-annual principal payments in 2020 to 2023					9,200
Semi-annual principal payments in 2024 to 2031					$ 7,150
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