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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Summary Of Financial Assets And Liabilities Accounted For At Fair Value
  Fair Value at September 30, 2011
  Total Level 1 Level 2   Level 3
        (In thousands)      
Assets:                  
Investments in equity securities $ 5,351 $ 5,351 $   $
Derivatives   14,149   1,018   2,695     10,436
Total assets $ 19,500 $ 6,369 $ 2,695   $ 10,436
Liabilities:                  
Derivatives $ 5,824 $ $ (415 ) $ 6,239
Summary Of Change In The Fair Values Of Financial Instruments Categorized As Level 3
  Three Months Ended
September 30, 2011
Nine Months Ended
September 30, 2011
 
  (In thousands)
Balance, beginning of period $ 10,474   $ 9,183  
Realized and unrealized losses recognized in earnings, net   (8,016 )   (15,140 )
Realized and unrealized losses recognized in other comprehensive income, net   (6,702 )   (3,227 )
Purchases   9,935     20,407  
Issuances       (2,160 )
Settlements   (1,494 )   (4,866 )
Balance, end of period $ 4,197   $ 4,197