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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
Financial Assets and Liabilities Fair Value Measurement      
Number of non-financial assets and liabilities impaired 0 0  
Assets      
Deferred compensation plan $ 13,152   $ 12,507
Derivative contracts 13,312   13,792
Total assets 26,464   26,299
Liabilities      
Deferred compensation plan 31,388   33,211
Derivative contracts 50,851   24,685
Total liabilities 82,239   57,896
Transfer of Assets from Level 1 to Level 2 0 0  
Transfer of Liabilities from Level 1 to Level 2 0 0  
Transfer of Assets from Level 2 to Level 1 0 0  
Transfer of Liabilities from Level 2 to Level 1 0 0  
Non-recurring basis
      
Assets      
Total assets 0    
Non-financial assets 0    
Liabilities      
Total liabilities 0    
Non-financial liabilities 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis
      
Assets      
Deferred compensation plan 13,152   12,507
Total assets 13,152   12,507
Liabilities      
Deferred compensation plan 31,388   33,211
Total liabilities 31,388   33,211
Significant Other Observable Inputs (Level 2) | Recurring basis
      
Liabilities      
Derivative contracts 10,624   6,983
Total liabilities 10,624   6,983
Significant Unobservable Inputs (Level 3) | Recurring basis
      
Assets      
Derivative contracts 13,312   13,792
Total assets 13,312   13,792
Liabilities      
Derivative contracts 40,227   17,702
Total liabilities $ 40,227   $ 17,702