Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Information [Abstract]
Costs relating to construction included in accounts payable and accrued expenses	$ 10,018	$ 21,416
Dividends payable	19,913	0
Interest paid	$ 42,806	$ 44,990

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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