Credit Agreement	6 Months Ended
Credit Agreement	Jun. 30, 2012
Credit Agreement [Abstract]
Credit Agreement	Credit Agreement: The Senior Credit Facility provides for borrowings up to $250 million (with sublimits of $250 million and $20 million for letters of credit and swingline loans, respectively). This agreement is unsecured and matures in October 2016, with proceeds available to be used for working capital, capital expenditures, dividends, share repurchases and other matters. At June 30, 2012, there were no outstanding borrowings under the Senior Credit Facility. There were $60.1 million outstanding letters of credit under the Senior Credit Facility as of June 30, 2012. Borrowings bear interest at either the bank’s base rate or LIBOR plus an additional amount ranging from 0.40% to 1.00% per annum, adjusted quarterly based on our leverage ratio (0.50% at June 30, 2012). We are also required to pay quarterly in arrears, a commitment fee for unused capacity ranging from 0.08% to 0.20% per annum, adjusted quarterly based on our leverage ratio (0.10% at June 30, 2012). The agreement requires quarterly compliance with respect to fixed charge coverage and leverage ratios. As of June 30, 2012, we were in compliance with all debt covenants.

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.

+ References+ Details