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Related Party Transactions - Schedule of Related Party Transactions (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) vessel | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) vessel | Sep. 30, 2020 USD ($) | Sep. 30, 2021 lease | Sep. 30, 2018
Related Party Transaction [Line Items] |  |  |  |  |  |
Voyage revenues | $ 146,577 | $ 148,935 | $ 448,148 | $ 437,027 |  |
Vessel operating expenses | (30,426) | (30,642) | (93,051) | (85,153) |  |
Time-charter hire expenses | 5,665 | 5,980 | 17,382 | 17,270 |  |
General and administrative expenses | (12,619) | (6,165) | (26,707) | (20,215) |  |
Equity income (loss) | 39,238 | 24,346 | 105,694 | 56,874 |  |
Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Voyage revenues | 9,869 | 9,704 | 29,285 | 27,881 |  |
Vessel operating expenses | (451) | (1,877) | (5,609) | (4,610) |  |
Time-charter hire expenses | 5,665 | 5,980 | 17,382 | 17,270 |  |
General and administrative expenses | (9,382) | (3,998) | (18,374) | (11,583) |  |
Equity income (loss) | $ 609 | 609 | $ 1,808 | 1,815 |  |
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 | $ 2,400 | 2,400 | $ 7,200 | 6,500 |  |
Bahrain LNG Joint Venture [Member] | Affiliated Entity [Member] | Cargo and Freight [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Voyage revenues | $ 7,500 | $ 7,300 | $ 22,100 | $ 21,400 |  |
Bahrain Spirit [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Lessor, Direct financing lease, Term of contract |  |  |  |  |  | 21 years

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