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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

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