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Financial Instruments (Changes in Level 3 Inputs) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Hypothetical change to estimated future cash flows attributable to commodity price swaps, percent 10.00%  
Estimated change in fair value resulting from hypothetical percentage change in future cash flows attributable to commodity price swaps $ 4,100,000  
Commodity Contract [Member] | Level 3 [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance, January 1, 2013 (33,658,000) 31,616,000
Unrealized (gains) losses included in other comprehensive income (49,202,000) (146,769,000)
Change in Fair Value Recognized in Cost of Product Sold 43,559,000 0
Settlements Recognized in Sales and Other Revenues 19,185,000 (34,125,000)
Settlements Recognized in Cost of Product Sold 13,867,000  
Ending balance, March 31, 2013 $ (6,249,000) $ (149,278,000)