XML 21 R54.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets:    
Derivatives $ 27,290 $ 32,315
Investments in equity securities 256,458 239,652
Liabilities:    
Derivatives 643 1,737
Total assets 283,748  
Level 1 [Member]
   
Assets:    
Derivatives 21,250  
Investments in equity securities 98,410  
Liabilities:    
Derivatives     
Total assets 119,660  
Level 2 [Member]
   
Assets:    
Derivatives     
Investments in equity securities 158,048  
Liabilities:    
Derivatives 245  
Total assets 158,048  
Level 3 [Member]
   
Assets:    
Derivatives 6,040  
Investments in equity securities     
Liabilities:    
Derivatives 398  
Total assets $ 6,040