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Fair Value Disclosures (Schedule Of Assets And Liabilities Fair Value) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |  |  |
Cash and cash equivalents |  | $ 256,468 | $ 304,211 |
Restricted cash |  | 38,974 | 51,979 |
Inventories carried at market |  | 196,925 | 154,022 | [1]
Unrealized gains on derivatives |  | 33,918 | 47,236 |
Other assets |  | 116 | 116 |
Total assets measured at fair value |  | 526,401 | 557,564 |
Liabilities: |  |  |  |
Accounts payable | [2] | 25,291 | 35,288 |
Unrealized losses on derivatives |  | 7,131 | 8,916 |
Other |  | 59 | 81 |
Total liabilities measured at fair value |  | 32,481 | 44,285 |
Fair Value Hedging [Member] |  |  |  |
Assets: |  |  |  |
Inventories carried at market |  |  | 77,000 |
Reclassification for Balance Sheet Presentation [Member] |  |  |  |
Assets: |  |  |  |
Margin deposits |  | (28,878) | (50,601) |
Unrealized gains on derivatives |  | 13,678 | 24,146 |
Total assets measured at fair value |  | (15,200) | (26,455) |
Liabilities: |  |  |  |
Unrealized losses on derivatives |  | (15,200) | (26,455) |
Total liabilities measured at fair value |  | (15,200) | (26,455) |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents |  | 256,468 | 304,211 |
Restricted cash |  | 38,974 | 51,979 |
Margin deposits |  | 28,878 | 50,601 |
Unrealized gains on derivatives |  | 10,823 | 8,272 |
Other assets |  | 115 | 116 |
Total assets measured at fair value |  | 335,258 | 415,179 |
Liabilities: |  |  |  |
Unrealized losses on derivatives |  | 15,200 | 26,455 |
Total liabilities measured at fair value |  | 15,200 | 26,455 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets: |  |  |  |
Inventories carried at market |  | 196,925 | 154,022 | [1]
Unrealized gains on derivatives |  | 9,417 | 14,818 |
Other assets |  | 1 |  |
Total assets measured at fair value |  | 206,343 | 168,840 |
Liabilities: |  |  |  |
Accounts payable | [2] | 25,291 | 35,288 |
Unrealized losses on derivatives |  | 7,131 | 8,916 |
Other |  | 59 | 81 |
Total liabilities measured at fair value |  | $ 32,481 | $ 44,285 |
[1] | Inventories carried at market have been revised from previously reported results to include $77.0 million of inventories held under a fair value hedging relationship. There was no impact to the financial statements resulting from this revision.
[2] | Accounts payable is generally stated at historical amounts with the exception of $25.3 million and $35.3 million at March 31, 2017 and December 31, 2016, 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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