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Fair Value Disclosures (Schedule Of Assets And Liabilities Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Cash and cash equivalents $ 233,860 $ 245,977
Restricted cash 40,950 23,919
Inventories carried at market 77,900 73,318
Unrealized gains on derivatives 21,956 14,515
Other assets 141 113
Total assets measured at fair value 374,807 357,842
Liabilities:    
Accounts payable [1] 19,355 37,294
Unrealized losses on derivatives 10,997 7,771
Total liabilities measured at fair value 30,352 45,065
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Cash and cash equivalents 233,860 245,977
Restricted cash 40,950 23,919
Other assets 112 113
Total assets measured at fair value 274,922 270,009
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Inventories carried at market 77,900 73,318
Unrealized gains on derivatives 21,956 14,515
Other assets 29  
Total assets measured at fair value 99,885 87,833
Liabilities:    
Accounts payable [1] 19,355 37,294
Unrealized losses on derivatives 10,997 7,771
Total liabilities measured at fair value $ 30,352 $ 45,065
[1] Accounts payable is generally stated at historical amounts with the exception of $19.4.million and $37.3 million at December 31, 2020 and 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.