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Financial Instruments - Credit Risk Narrative (Details) - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Maximum exposure to credit risk		$ 1,403,491,000	$ 1,586,978,000
Accounts receivable	[1]	$ 8,928,000	4,638,000
Accounts receivable, threshold period past due, writeoff		120 days
Current expected credit loss		$ 74,000	136,000
Cash and cash equivalents		1,078,023,000	1,199,693,000
Short-term investments		211,766,000	306,347,000
Advances to joint ventures		467,000	19,437,000	$ 4,689,000
Advances to joint ventures, allowance for credit loss		$ 0	$ 0
Four Customers | Accounts Receivable | Credit Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		78.00%
Two Customers | Accounts Receivable | Credit Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage			56.00%
[1] Net of current expected credit loss allowance of $74 as of December 31, 2020 (December 31, 2019 – $136)

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