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Credit Agreements	3 Months Ended
Credit Agreements	Mar. 31, 2015
Line of Credit Facility [Abstract]
Credit Agreements	Credit Agreement At March 31, 2015, the Company had no borrowings outstanding under its revolving credit facility pursuant to the 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, as amended on April 5, 2013, and had $38.9 million of letters of credit outstanding, which reduced the total available credit under the revolving credit facility to $161.1 million.