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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets    
Deferred compensation plan $ 10,608 $ 10,838
Derivative Contracts 50,824 195,512
Total Assets 61,432 206,350
Liabilities    
Deferred Compensation Plan 23,893 20,187
Derivative Contracts 192 385
Total Liabilities 24,085 20,572
Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Assets    
Deferred compensation plan 10,608 10,838
Total Assets 10,608 10,838
Liabilities    
Deferred Compensation Plan 23,893 20,187
Total Liabilities 23,893 20,187
Significant Unobservable Inputs (Level 3)
    
Assets    
Derivative Contracts 41,351 195,512
Total Assets 41,351 195,512
Liabilities    
Derivative Contracts 192 385
Total Liabilities 192 385
Significant Other Observable Inputs (Level 2)
    
Assets    
Derivative Contracts 9,473  
Total Assets $ 9,473