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Fair Value Disclosures (Schedule Of Assets And Liabilities Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |  |
Cash and cash equivalents |  | $ 150,407 | $ 245,977
Restricted cash |  | 31,877 | 23,919
Inventories carried at market |  | 29,963 | 73,318
Unrealized gains on derivatives |  | 14,687 | 14,515
Other assets |  | 3,120 | 113
Total assets measured at fair value |  | 230,054 | 357,842
Liabilities: |  |  |
Accounts payable | [1] | 24,074 | 37,294
Unrealized losses on derivatives |  | 8,325 | 7,771
Total liabilities measured at fair value |  | 32,399 | 45,065
Accounts payable, not stated at historical amounts |  | 12,300 | 37,300
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents |  | 150,407 | 245,977
Restricted cash |  | 31,877 | 23,919
Other assets |  | 112 | 113
Total assets measured at fair value |  | 182,396 | 270,009
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Inventories carried at market |  | 29,963 | 73,318
Unrealized gains on derivatives |  | 14,687 | 14,515
Other assets |  | 3,008 |
Total assets measured at fair value |  | 47,658 | 87,833
Liabilities: |  |  |
Accounts payable | [1] | 24,074 | 37,294
Unrealized losses on derivatives |  | 8,325 | 7,771
Total liabilities measured at fair value |  | $ 32,399 | $ 45,065
[1] | Accounts payable is generally stated at historical amounts with the exception of $12.3 million and $37.3 million at September 30, 2020 and December 31, 2019, respectively, related to certain delivered inventory for which the payable fluctuates based on changes in commodity prices. These payables are hybrid financial instruments for which the company has elected the fair value option.

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