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Debt | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Debt | Debt Long-term debt consisted of the following (in thousands):
| June 30, |  | December 31,
| 2019 |  | 2018
Bank credit facility - term loan | $ | 75,800 |  |  | $ | 80,800 |
Bank credit facility - revolver loans | 205,144 |  |  | 81,934 |
Principal amount of long-term debt | 280,944 |  |  | 162,734 |
Less debt issuance costs | (1,868 | ) |  | (2,135 | )
Total long-term debt | 279,076 |  |  | 160,599 |
Less current portion | (10,091 | ) |  | (9,466 | )
Long-term debt, net of current portion | $ | 268,985 |  |  | $ | 151,133 |
We have a loan agreement with a group of banks to provide working capital, letters of credit and acquisition financing. The loan agreement, which was amended in January 2018 and expires in January 2023, has a term loan facility and a revolving loan facility. The revolving loan facility provides for revolving loans and letters of credit. Financing costs associated with the loan agreement amendment of approximately $1.5 million were capitalized and are being amortized over the five-year life of the loan. The fair value of outstanding debt as of June 30, 2019 under our bank loan facilities approximates its carrying value using Level 2 inputs based on market data on companies with a corporate rating similar to ours that have recently priced credit facilities. Our required term loan payments after June 30, 2019 are as follows (in thousands):
2019 |  | $ | 5,000 |
2020 |  | 11,875 |
2021 |  | 14,375 |
2022 |  | 15,000 |
2023 |  | 29,550 |
Total |  | $ | 75,800 |
The maximum amount of credit available to us under the loan agreement for revolving loans and letters of credit as of June 30, 2019 was $300 million. Subject to the terms of the loan agreement, we may borrow and repay the revolving loan borrowings as our cash flows require or permit. We pay an unused commitment fee and fees on letters of credit that are issued. We had $18 thousand and $57 thousand in letters of credit outstanding as of June 30, 2019 and December 31, 2018, respectively. Under the loan agreement we may elect to increase the maximum availability of the term loan facility, the revolving loan facility, or both facilities, up to an aggregate additional amount of $100 million. We pay interest on the term loan borrowings and revolving loan borrowings at LIBOR plus a base margin or at a base rate (typically the prime rate) plus a base margin. As of June 30, 2019, the LIBOR base margin was 2.50% and the base rate base margin was 1.25%. The base margins increase or decrease in increments as our Total Funded Debt/EBITDA Ratio increases or decreases, respectively. The loan agreement requires us to have interest rate hedges on a portion of the outstanding term loan for the first three years after the January 2018 amendment date of the agreement. To mitigate the risks associated with future interest rate movements we have employed interest rate hedges to fix the rate on a portion of our outstanding borrowings for various periods. We executed interest rate swap agreements in February 2019 and February 2018. The notional amount of the interest rate swap agreements was $125 million and $50 million as of June 30, 2019 and December 31, 2018, respectively. After taking into account the impact of interest rate swap agreements, as of June 30, 2019, interest rates on portions of our outstanding debt ranged from 4.89% to 6.75%, and the effective interest rate on our aggregate outstanding debt was 5.16%. Interest expense incurred on bank loan borrowings and interest rate hedges was approximately $3.4 million and $1.7 million for the three months ended June 30, 2019 and 2018, respectively. Interest expense incurred on bank loan borrowings and interest rate hedges was approximately $6.3 million and $3.2 million for the six months ended June 30, 2019 and 2018, respectively. The loan agreement contains collateral requirements to secure our loan agreement obligations, restrictive covenants, a limit on annual dividends, and other affirmative and negative covenants, conditions, and limitations. Restrictive covenants include a maximum Total Funded Debt/EBITDA Ratio and a minimum Fixed Charge Coverage Ratio. We were in compliance with required ratios and other terms and conditions at June 30, 2019.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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