Bank Debt	3 Months Ended
Mar. 31, 2017
Bank Debt [Abstract]
Bank Debt	11.BANK DEBT On March 28, 2017, we entered into a new credit agreement with a syndicate of banks, amending and extending the maturity date of the five-year $400 million revolving credit facility provided under our prior credit agreement. As amended and restated, the credit facility matures on March 28, 2022. At our option, subject to the terms and conditions specified in the credit agreement, we may elect to increase commitments under the credit facility up to an aggregate amount of $500 million. Borrowings and repayments under the credit facility may be made in multiple currencies including United States (U.S.) Dollars, Canadian Dollars, United Kingdom (U.K.) Pound Sterling and Euro. At March 31, 2017, we had aggregate borrowings outstanding of $178.3 million, compared to $135.0 million at December 31, 2016. Based on our financial covenants at March 31, 2017, approximately $217.8 million in additional borrowings were available to us under the credit facility. At March 31, 2017, we had $3.9 million of unused letters of credit under our credit facility, which have been included as a reduction in the available borrowings above. The letters of credit are primarily related to the requirements of certain lease agreements for office space. At our option, borrowings under the credit facility bear interest at a variable rate equal to an applicable base rate or LIBOR, in each case plus an applicable margin. For LIBOR loans, the applicable margin varies depending upon our consolidated leverage ratio (the ratio of total funded debt to adjusted EBITDA, as defined in the credit agreement). At March 31, 2017, the applicable margins on LIBOR and base rate loans were 1.00% and 0.00%, respectively. Depending upon our performance and financial condition, our LIBOR loans will have applicable margins varying between 1.00% and 2.00%, and our base rate loans have applicable margins varying between zero and 1.00%. Our average borrowing rate (including the impact of our interest rate derivatives; see Note 10 — Derivatives and Hedging Activity) was 2.7% and 2.3% for the three months ended March 31, 2017 and 2016, respectively. Our credit agreement contains certain financial covenants, including covenants that require that we maintain a consolidated leverage ratio of not greater than 3.5:1, with certain exceptions as defined in the agreement and a consolidated interest coverage ratio (the ratio of the sum of adjusted EBIT, as defined in the credit agreement, to cash interest expense) of not less than 2.0:1. At March 31, 2017, under the definitions in the credit agreement, our consolidated leverage ratio was 1.1 and our consolidated interest coverage ratio was 29.4. In addition, the credit agreement contains customary affirmative and negative covenants (subject to exceptions), including covenants that in certain circumstances limit our ability to incur liens or other encumbrances, make investments and acquisitions, incur indebtedness, enter into mergers, consolidations and asset dispositions, pay cash dividends after the occurrence of an event of default, change the nature of our business and engage in transactions with affiliates, as well as customary provisions with respect to events of default. We were in compliance with the covenants contained in our credit agreement at March 31, 2017; however, there can be no assurances that we will remain in compliance in the future.

11.BANK DEBT

On March 28, 2017, we entered into a new credit agreement with a syndicate of banks, amending and extending the maturity date of the five-year $400 million revolving credit facility provided under our prior credit agreement. As amended and restated, the credit facility matures on March 28, 2022. At our option, subject to the terms and conditions specified in the credit agreement, we may elect to increase commitments under the credit facility up to an aggregate amount of $500 million. Borrowings and repayments under the credit facility may be made in multiple currencies including United States (U.S.) Dollars, Canadian Dollars, United Kingdom (U.K.) Pound Sterling and Euro.

At March 31, 2017, we had aggregate borrowings outstanding of $178.3 million, compared to $135.0 million at December 31, 2016. Based on our financial covenants at March 31, 2017, approximately $217.8 million in additional borrowings were available to us under the credit facility. At March 31, 2017, we had $3.9 million of unused letters of credit under our credit facility, which have been included as a reduction in the available borrowings above. The letters of credit are primarily related to the requirements of certain lease agreements for office space.

At our option, borrowings under the credit facility bear interest at a variable rate equal to an applicable base rate or LIBOR, in each case plus an applicable margin. For LIBOR loans, the applicable margin varies depending upon our consolidated leverage ratio (the ratio of total funded debt to adjusted EBITDA, as defined in the credit agreement). At March 31, 2017, the applicable margins on LIBOR and base rate loans were 1.00% and 0.00%, respectively. Depending upon our performance and financial condition, our LIBOR loans will have applicable margins varying between 1.00% and 2.00%, and our base rate loans have applicable margins varying between zero and 1.00%. Our average borrowing rate (including the impact of our interest rate derivatives; see Note 10 — Derivatives and Hedging Activity) was 2.7% and 2.3% for the three months ended March 31, 2017 and 2016, respectively.

Our credit agreement contains certain financial covenants, including covenants that require that we maintain a consolidated leverage ratio of not greater than 3.5:1, with certain exceptions as defined in the agreement and a consolidated interest coverage ratio (the ratio of the sum of adjusted EBIT, as defined in the credit agreement, to cash interest expense) of not less than 2.0:1. At March 31, 2017, under the definitions in the credit agreement, our consolidated leverage ratio was 1.1 and our consolidated interest coverage ratio was 29.4. In addition, the credit agreement contains customary affirmative and negative covenants (subject to exceptions), including covenants that in certain circumstances limit our ability to incur liens or other encumbrances, make investments and acquisitions, incur indebtedness, enter into mergers, consolidations and asset dispositions, pay cash dividends after the occurrence of an event of default, change the nature of our business and engage in transactions with affiliates, as well as customary provisions with respect to events of default. We were in compliance with the covenants contained in our credit agreement at March 31, 2017; however, there can be no assurances that we will remain in compliance in the future.