Credit Agreement

3 Months Ended

Mar. 31, 2018

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 March 31, 2018, the Company had no amounts outstanding under its revolving credit facility and had $14.9 million of letters of credit outstanding governed by the facility, which reduces the total available revolving credit under the Credit Agreement to $485.1 million.