Notes Payable and Long-Term Debt	12 Months Ended
Dec. 31, 2012
Notes Payable and Long-Term Debt
Notes Payable and Long-Term Debt	(3) Notes Payable and Long-Term Debt In August 2011, the Company entered into a Credit Agreement (the Credit Agreement) with JPMorgan Chase Bank, National Association as the administrative agent, Comerica Bank and HSBC Bank USA, National Association as syndication agents, and the lenders party thereto. In August 2012, the Company amended and restated in its entirety the Credit Agreement (Amended and Restated Credit Agreement). The Amended and Restated Credit Agreement is a five-year, $400,000 secured revolving credit facility that contains a $75,000 sublimit for the issuance of letters of credit and a $5,000 sublimit for swingline loans and matures on August 30, 2017. Subject to customary conditions and the approval of any lender whose commitment would be increased, the Company has the option to increase the maximum principal amount available under the Amended and Restated Credit Agreement by up to an additional $100,000, resulting in a maximum available principal amount of $500,000. None of the lenders under the Amended and Restated Credit Agreement has committed at this time or is obligated to provide any such increase in the commitments. At the Company's option, revolving loans issued under the Amended and Restated Credit Agreement will bear interest at either the adjusted London Interbank Offered Rate (LIBOR) for 30 days (0.21% at December 31, 2012) plus 1.75% per annum, in the case of LIBOR borrowings, or at the alternate base rate plus 0.75% per annum, and thereafter the interest rate will fluctuate between adjusted LIBOR plus 1.50% per annum and adjusted LIBOR plus 2.25% per annum (or between the alternate base rate plus 0.50% per annum and the alternate base rate plus 1.25% per annum), based upon the Company's total adjusted leverage ratio at such time. In addition, the Company will initially be required to pay fees of 0.25% per annum on the daily unused amount of the revolving credit facility, and thereafter the fee rate will fluctuate between 0.20% and 0.35% per annum, based upon the Company's total adjusted leverage ratio. The Company's obligations under the Amended and Restated Credit Agreement are guaranteed by the Company's existing and future domestic subsidiaries, other than certain immaterial subsidiaries, and foreign subsidiaries (the Guarantors), and is secured by a first-priority security interest in substantially all of the assets of the Company and the Guarantors, including all or a portion of the equity interests of certain of the Company's domestic and foreign subsidiaries. The Amended and Restated Credit Agreement contains financial covenants which include: the asset coverage ratio must be greater than 1.10 to 1.00; the sum of the consolidated annual earnings before interest, taxes, depreciation, and amortization (EBITDA) and annual rental expense, divided by the sum of the annual interest expense and the annual rental expense must be greater than 2.25 to 1.00; and other customary limitations. The Amended and Restated Credit Agreement contains certain other covenants which include: the maximum additional secured debt related to a capital asset may not exceed $65,000 per year, excluding $75,000 for the Company's new corporate headquarters, the maximum additional unsecured debt may not exceed $200,000; the maximum secured debt not related to a capital asset may not exceed $5,000, a judgment may not exceed $10,000; maximum ERISA event of $10,000 in one year, $20,000 in all years; the Company may not have a change of control (as defined in the Amended and Restated Credit Agreement); acquisitions may not exceed $100,000, if the total adjusted leverage ratio does not exceed 2.75 to 1.00 and the Company must have a minimum amount of cash plus unused credit of $75,000. There is no restriction on dividends or share repurchases if the minimum amount of cash and unused credit is $150,000 for the first, second and fourth quarter, and $75,000 for the third quarter and the asset coverage ratio is greater than 1.10 to 1.00, on a proforma basis. At December 31, 2012, the Company had $33,000 of outstanding borrowings, with a weighted average interest rate of 2.0%, under the Amended and Restated Credit Agreement and outstanding letters of credit of $189. As a result, $366,811 was available under the Amended and Restated Credit Agreement at December 31, 2012. The Company incurred approximately $1,800 of deferred financing costs which were included in prepaid expenses and are amortized over the term of the Amended and Restated Credit Agreement using the straight-line method. Subsequent to December 31, 2012, the Company repaid $33,000, resulting in no outstanding borrowings under the Amended and Restated Credit Agreement as of March 1, 2013.

(3) Notes Payable and Long-Term Debt

In August 2011, the Company entered into a Credit Agreement (the Credit Agreement) with JPMorgan Chase Bank, National Association as the administrative agent, Comerica Bank and HSBC Bank USA, National Association as syndication agents, and the lenders party thereto. In August 2012, the Company amended and restated in its entirety the Credit Agreement (Amended and Restated Credit Agreement). The Amended and Restated Credit Agreement is a five-year, $400,000 secured revolving credit facility that contains a $75,000 sublimit for the issuance of letters of credit and a $5,000 sublimit for swingline loans and matures on August 30, 2017. Subject to customary conditions and the approval of any lender whose commitment would be increased, the Company has the option to increase the maximum principal amount available under the Amended and Restated Credit Agreement by up to an additional $100,000, resulting in a maximum available principal amount of $500,000. None of the lenders under the Amended and Restated Credit Agreement has committed at this time or is obligated to provide any such increase in the commitments. At the Company's option, revolving loans issued under the Amended and Restated Credit Agreement will bear interest at either the adjusted London Interbank Offered Rate (LIBOR) for 30 days (0.21% at December 31, 2012) plus 1.75% per annum, in the case of LIBOR borrowings, or at the alternate base rate plus 0.75% per annum, and thereafter the interest rate will fluctuate between adjusted LIBOR plus 1.50% per annum and adjusted LIBOR plus 2.25% per annum (or between the alternate base rate plus 0.50% per annum and the alternate base rate plus 1.25% per annum), based upon the Company's total adjusted leverage ratio at such time. In addition, the Company will initially be required to pay fees of 0.25% per annum on the daily unused amount of the revolving credit facility, and thereafter the fee rate will fluctuate between 0.20% and 0.35% per annum, based upon the Company's total adjusted leverage ratio.

The Company's obligations under the Amended and Restated Credit Agreement are guaranteed by the Company's existing and future domestic subsidiaries, other than certain immaterial subsidiaries, and foreign subsidiaries (the Guarantors), and is secured by a first-priority security interest in substantially all of the assets of the Company and the Guarantors, including all or a portion of the equity interests of certain of the Company's domestic and foreign subsidiaries.

The Amended and Restated Credit Agreement contains financial covenants which include: the asset coverage ratio must be greater than 1.10 to 1.00; the sum of the consolidated annual earnings before interest, taxes, depreciation, and amortization (EBITDA) and annual rental expense, divided by the sum of the annual interest expense and the annual rental expense must be greater than 2.25 to 1.00; and other customary limitations. The Amended and Restated Credit Agreement contains certain other covenants which include: the maximum additional secured debt related to a capital asset may not exceed $65,000 per year, excluding $75,000 for the Company's new corporate headquarters, the maximum additional unsecured debt may not exceed $200,000; the maximum secured debt not related to a capital asset may not exceed $5,000, a judgment may not exceed $10,000; maximum ERISA event of $10,000 in one year, $20,000 in all years; the Company may not have a change of control (as defined in the Amended and Restated Credit Agreement); acquisitions may not exceed $100,000, if the total adjusted leverage ratio does not exceed 2.75 to 1.00 and the Company must have a minimum amount of cash plus unused credit of $75,000. There is no restriction on dividends or share repurchases if the minimum amount of cash and unused credit is $150,000 for the first, second and fourth quarter, and $75,000 for the third quarter and the asset coverage ratio is greater than 1.10 to 1.00, on a proforma basis.

At December 31, 2012, the Company had $33,000 of outstanding borrowings, with a weighted average interest rate of 2.0%, under the Amended and Restated Credit Agreement and outstanding letters of credit of $189. As a result, $366,811 was available under the Amended and Restated Credit Agreement at December 31, 2012. The Company incurred approximately $1,800 of deferred financing costs which were included in prepaid expenses and are amortized over the term of the Amended and Restated Credit Agreement using the straight-line method. Subsequent to December 31, 2012, the Company repaid $33,000, resulting in no outstanding borrowings under the Amended and Restated Credit Agreement as of March 1, 2013.