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Derivative Instruments and Hedging Activities - Summary of Cross Currency Swap Agreements (Details) - Cross-currency swap agreements kr in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 NOK (kr)
Derivative [Line Items]
Fair Value / Carrying Amount of Asset (Liability) $	$ (12,704)
NIBOR | 6.00%
Derivative [Line Items]
Derivative, Notional Amount	$ 146,500	kr 1,200,000
Derivative, Basis Spread on Variable Rate	6.00%	6.00%
Fixed Rate Payable	7.72%	7.72%
Fair Value / Carrying Amount of Asset (Liability) $	$ (8,667)
Weighted- Average Remaining Term (Years)	3 months 18 days
NIBOR | 4.60%
Derivative [Line Items]
Derivative, Notional Amount	$ 102,000	kr 850,000
Derivative, Basis Spread on Variable Rate	4.60%	4.60%
Fixed Rate Payable	7.89%	7.89%
Fair Value / Carrying Amount of Asset (Liability) $	$ (9,843)
Weighted- Average Remaining Term (Years)	2 years 2 months 12 days
NIBOR | 5.15%
Derivative [Line Items]
Derivative, Notional Amount	$ 112,000	kr 1,000,000
Derivative, Basis Spread on Variable Rate	5.15%	5.15%
Fixed Rate Payable	5.74%	5.74%
Fair Value / Carrying Amount of Asset (Liability) $	$ 5,806
Weighted- Average Remaining Term (Years)	4 years 2 months 12 days

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- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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- Definition

Fixed interest rate related to the interest rate derivative.

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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.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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