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Segment Reporting - Reconciliation of Total Segment Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 4,813,960	$ 4,854,004
Unallocated:
Cash and cash equivalents	109,596	206,762	$ 201,036	$ 160,221
Advances to affiliates	14,664	4,924
LNG Segment [Member]
Segment Reporting Information [Line Items]
Total assets	4,441,653	4,395,336
LPG Segment [Member]
Segment Reporting Information [Line Items]
Total assets	248,047	246,982
Cash and Cash Equivalents [Member]
Unallocated:
Cash and cash equivalents	109,596	206,762
Affiliated Entity [Member]
Unallocated:
Advances to affiliates	$ 14,664	$ 4,924

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