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Fair Value Disclosures (Schedule Of Assets And Liabilities Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Assets:    
Cash and cash equivalents $ 407,359 $ 384,867
Restricted cash 34,219 27,018
Inventories carried at market 45,199 43,936
Unrealized gains on derivatives 38,577 30,540
Other assets 116 117
Total assets measured at fair value 525,470 486,478
Liabilities:    
Unrealized losses on derivatives 20,831 8,245
Other 15  
Total liabilities measured at fair value 20,846 8,245
Reclassification for Balance Sheet Presentation [Member]    
Assets:    
Margin deposits (8,792) (7,658)
Unrealized gains on derivatives (4,989) 3,639
Total assets measured at fair value (13,781) (4,019)
Liabilities:    
Unrealized losses on derivatives (13,781) (4,019)
Total liabilities measured at fair value (13,781) (4,019)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Cash and cash equivalents 407,359 384,867
Restricted cash 34,219 27,018
Margin deposits 8,792 7,658
Unrealized gains on derivatives 26,098 19,756
Other assets 116 117
Total assets measured at fair value 476,584 439,416
Liabilities:    
Unrealized losses on derivatives 10,938 4,492
Total liabilities measured at fair value 10,938 4,492
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Inventories carried at market 45,199 43,936
Unrealized gains on derivatives 17,468 7,145
Total assets measured at fair value 62,667 51,081
Liabilities:    
Unrealized losses on derivatives 23,674 7,772
Other 15  
Total liabilities measured at fair value $ 23,689 $ 7,772