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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2011
Fair Value of Financial Instruments [Abstract] 
Fair Value of Financial Instruments
 
9.   Fair Value of Financial Instruments
 
The Corporation’s financial instruments include cash and cash equivalents, restricted cash, marketable securities, short-term receivables and payables, and debt. Financial instruments also include an interest rate swap agreement, which is discussed further in Note 11 below. The carrying amounts of the Corporation’s financial instruments generally approximated their fair values at September 30, 2011 and December 31, 2010, except that, based on the borrowing rates available to the Corporation under current market conditions, the fair value of long-term debt (including current maturities) was approximately $622 million at September 30, 2011 and $588 million at December 31, 2010.