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Credit Agreements	6 Months Ended
Credit Agreements	Jun. 30, 2013
Line of Credit Facility [Abstract]
Credit Agreements	Credit Agreements At June 30, 2013, the Company had no borrowings outstanding under its Credit Agreement, dated February 8, 2011 with Bank of America, N.A., U.S. Bank National Association, JPMorgan Chase Bank N.A. and other Lenders, and $12.4 million of letters of credit outstanding, which reduces the total available credit under the Credit Agreement to $187.6 million. On April 5, 2013, the Credit Agreement was amended to extend the maturity of the revolving credit facility from February 8, 2016 to April 5, 2018. The amendment also incorporated a revised schedule of interest rates.