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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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- Definition

Term of lessor's direct financing lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

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Amount of operating lease expense. Excludes sublease income.

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Related Party Transactions - Schedule of Related Party Transactions (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) vessel	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) vessel	Jun. 30, 2020 USD ($)	Jun. 30, 2021 lease	Jun. 30, 2019
Related Party Transaction [Line Items]
Voyage revenues	$ 148,769	$ 148,205	$ 301,571	$ 288,092
Vessel operating expenses	(32,536)	(28,407)	(62,625)	(54,511)
Time-charter hire expenses	5,867	5,368	11,717	11,290
General and administrative expenses	(6,921)	(7,883)	(14,088)	(14,050)
Equity income (loss)	28,940	32,155	66,456	32,528
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Voyage revenues	10,300	9,200	19,416	18,177
Vessel operating expenses	(2,886)	(1,337)	(5,158)	(2,733)
Time-charter hire expenses	5,867	5,368	11,717	11,290
General and administrative expenses	(4,145)	(3,787)	(8,992)	(7,585)
Equity income (loss)	$ 602	603	$ 1,198	1,206
LNG Carriers [Member]
Related Party Transaction [Line Items]
Number Of Vessels	9		9		9
LNG Carriers [Member] \| Affiliated Entity [Member] \| Yamal Lng Joint Venture [Member]
Related Party Transaction [Line Items]
Number Of Vessels \| vessel	6		6
Bahrain LNG Joint Venture [Member] \| Affiliated Entity [Member] \| Management Service [Member]
Related Party Transaction [Line Items]
Voyage revenues	$ 2,900	2,000	$ 4,800	4,100
Bahrain LNG Joint Venture [Member] \| Affiliated Entity [Member] \| Cargo and Freight [Member]
Related Party Transaction [Line Items]
Voyage revenues	$ 7,400	$ 7,200	$ 14,600	$ 14,100
Bahrain Spirit [Member]
Related Party Transaction [Line Items]
Lessor, Direct financing lease, Term of contract						21 years