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Financial Instruments (Changes in Level 3 Inputs) (Details) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Level 3
Commodity Contract [Member]
Dec. 31, 2012
Level 3
Commodity Contract [Member]
Dec. 31, 2011
Level 3
Commodity Contract [Member]
Dec. 31, 2013
Level 3
Commodity Contract [Member]
Change in Fair Value [Member]
Dec. 31, 2012
Level 3
Commodity Contract [Member]
Change in Fair Value [Member]
Dec. 31, 2013
Level 3
Commodity Contract [Member]
Change in Fair Value [Member]
Cost of products sold [Member]
Dec. 31, 2012
Level 3
Commodity Contract [Member]
Change in Fair Value [Member]
Cost of products sold [Member]
Dec. 31, 2013
Level 3
Commodity Contract [Member]
Settlement Date Fair Value of Contractual Maturities [Member]
Cost of products sold [Member]
Dec. 31, 2012
Level 3
Commodity Contract [Member]
Settlement Date Fair Value of Contractual Maturities [Member]
Cost of products sold [Member]
Dec. 31, 2013
Level 3
Commodity Contract [Member]
Settlement Date Fair Value of Contractual Maturities [Member]
Sales and other revenues [Member]
Dec. 31, 2012
Level 3
Commodity Contract [Member]
Settlement Date Fair Value of Contractual Maturities [Member]
Sales and other revenues [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Net Asset Liability Value     $ (33,658,000)                  
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   (35,318,000) (33,658,000) 31,616,000                
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                        
Recognized in other comprehensive income         (71,751,000) (120,966,000)            
Recognized in earnings             35,236,000 (39,463,000) 14,795,000 (3,595,000) 20,060,000 98,750,000
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 $ 3,500,000