Nominal or face amount used to calculate payment on derivative.

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=121590274&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=121590274&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Derivatives - Summary of Derivative Contracts (Details) - Sep. 30, 2020 kr in Thousands, $ in Thousands	NOK (kr)	USD ($)
Designated \| Put Option
Derivative [Line Items]
Notional Amount \| kr	kr 0
Designated \| Interest Rate Swap
Derivative [Line Items]
Notional Amount \| $		$ 0
Non-Designated \| Put Option
Derivative [Line Items]
Notional Amount \| kr	kr 928,000
Non-Designated \| Interest Rate Swap
Derivative [Line Items]
Notional Amount \| $		$ 109,526