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Credit Agreement	9 Months Ended
Credit Agreement	Sep. 30, 2017
Debt Disclosure [Abstract]
Credit Agreements	Credit Agreement On February 8, 2011, the Company entered into a credit agreement 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, October 27, 2015 and May 31, 2016 (the "Credit Agreement") which provides for a $500 million revolving line of credit. At September 30, 2017, the Company had no amounts outstanding under its revolving credit facility and had $16.9 million of letters of credit outstanding governed by the facility, which reduces the total available revolving credit under the Credit Agreement to $483.1 million.