XML 46 R41.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Financial Assets and Financial Liabilities Measured at Fair Value (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Carrying Value
   
Carrying values and estimated fair values of long-term debt, including current maturities    
Total long-term debt $ 1,463,071 $ 1,285,674
Fair Value | (Level 2)
   
Carrying values and estimated fair values of long-term debt, including current maturities    
Total long-term debt $ 1,577,330 $ 1,388,019