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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.