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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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