Credit Agreement	12 Months Ended
Dec. 31, 2014
Line of Credit Facility [Abstract]
Credit Agreements	Credit Agreement On February 8, 2011, the Company entered into a Credit Agreement (“Credit Agreement”) with Bank of America, N.A., U.S. Bank National Association, JPMorgan Chase Bank N.A. and other Lenders. The Credit Agreement provides for a $200 million, five-year revolving line of credit. On April 5, 2013, the Credit Agreement was amended to extend the maturity of the revolving credit facility from April 8, 2016 to April 5, 2018 in addition to incorporating a $150 million term loan facility maturing April 5, 2019. The amendment also incorporated a revised schedule of fees and interest rate spreads. The Company has the right, subject to certain conditions including approval of additional commitments by qualified lenders, to increase the revolving line of credit under the Credit Agreement by an additional $150 million at any time prior to April 5, 2018. The Credit Agreement allows the Company and certain designated subsidiaries to borrow in United States dollars, euros, Swedish kronor, British pound sterling, Japanese yen, Canadian dollars, Australian dollars and other agreed upon currencies. Borrowing rates under the Credit Agreement are determined at the Company’s option at the time of each borrowing and are generally based on either the prime lending rate of Bank of America, N.A. or the rate of interest paid for deposits in the relevant currency, plus a specified spread based on an established consolidated total leverage ratio pricing grid, which specified margins ranging from 0.25 percent to 2.25 percent per annum based on the type of loan and the total leverage ratio of the Company. Including the respective spreads, the one-month LIBOR interest rate was 1.669 percent per annum and the prime lending rate was 3.75 percent per annum at December 31, 2014. The Credit Agreement requires the Company to pay a commitment fee on the amount of unused revolving commitments at a rate, based on the Company’s total leverage ratio, which commitment fee rate ranges from 0.25 percent to 0.40 percent of unused revolving commitments. At December 31, 2014, the commitment fee rate was 0.30 percent per annum. The Credit Agreement contains two financial covenants that require the maintenance of a total leverage ratio and an interest coverage ratio, with which the Company was in compliance at December 31, 2014. The credit facilities available under the Credit Agreement are unsecured. At December 31, 2014, the Company had no revolving loans outstanding under the Credit Agreement and had $44.0 million of letters of credit outstanding, which reduces the total available revolving credit under the Credit Agreement.

Credit Agreement

On February 8, 2011, the Company entered into a Credit Agreement (“Credit Agreement”) with Bank of America, N.A., U.S. Bank National Association, JPMorgan Chase Bank N.A. and other Lenders. The Credit Agreement provides for a $200 million, five-year revolving line of credit. On April 5, 2013, the Credit Agreement was amended to extend the maturity of the revolving credit facility from April 8, 2016 to April 5, 2018 in addition to incorporating a $150 million term loan facility maturing April 5, 2019. The amendment also incorporated a revised schedule of fees and interest rate spreads. The Company has the right, subject to certain conditions including approval of additional commitments by qualified lenders, to increase the revolving line of credit under the Credit Agreement by an additional $150 million at any time prior to April 5, 2018. The Credit Agreement allows the Company and certain designated subsidiaries to borrow in United States dollars, euros, Swedish kronor, British pound sterling, Japanese yen, Canadian dollars, Australian dollars and other agreed upon currencies. Borrowing rates under the Credit Agreement are determined at the Company’s option at the time of each borrowing and are generally based on either the prime lending rate of Bank of America, N.A. or the rate of interest paid for deposits in the relevant currency, plus a specified spread based on an established consolidated total leverage ratio pricing grid, which specified margins ranging from 0.25 percent to 2.25 percent per annum based on the type of loan and the total leverage ratio of the Company. Including the respective spreads, the one-month LIBOR interest rate was 1.669 percent per annum and the prime lending rate was 3.75 percent per annum at December 31, 2014. The Credit Agreement requires the Company to pay a commitment fee on the amount of unused revolving commitments at a rate, based on the Company’s total leverage ratio, which commitment fee rate ranges from 0.25 percent to 0.40 percent of unused revolving commitments. At December 31, 2014, the commitment fee rate was 0.30 percent per annum. The Credit Agreement contains two financial covenants that require the maintenance of a total leverage ratio and an interest coverage ratio, with which the Company was in compliance at December 31, 2014. The credit facilities available under the Credit Agreement are unsecured. At December 31, 2014, the Company had no revolving loans outstanding under the Credit Agreement and had $44.0 million of letters of credit outstanding, which reduces the total available revolving credit under the Credit Agreement.