Revolving Credit Agreement	6 Months Ended
Revolving Credit Agreement	Jun. 30, 2011
Notes to Condensed Consolidated Financial Statements [Abstract]
Revolving Credit Agreement	Revolving Credit Agreement The Company has a revolving credit agreement with a group of thirteen banks at an interest rate based on the London Interbank Offered Rate (“LIBOR”) that consists of an unsecured $200,000 five-year facility expiring in May 2012. There was $30,000 in borrowings outstanding under the credit agreement at June 30, 2011 and no borrowings outstanding at December 31, 2010.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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