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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.