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Debt | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Debt | Debt Long-term debt consisted of the following (in thousands):
| December 31,
| 2018 |  | 2017
Bank credit facility - term loan | $ | 80,800 |  |  | $ | 94,375 |
Bank credit facility - revolver loans | 81,934 |  |  | 79,324 |
Principal amount of long-term debt | 162,734 |  |  | 173,699 |
Less debt issuance costs | (2,135 | ) |  | (1,125 | )
Total long-term debt | 160,599 |  |  | 172,574 |
Less current portion | (9,466 | ) |  | (6,960 | )
Long-term debt, net of current portion | $ | 151,133 |  |  | $ | 165,614 |
We have a loan agreement with a group of banks to provide working capital support, letters of credit and finance acquisitions. The loan agreement, which was amended in January 2018 and expires in January 2023, is comprised of a term loan facility and a revolving loan facility. The revolving loan facility provides for revolving loans and letters of credit. The fair value of outstanding debt under our bank loan facilities as of December 31, 2018 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 December 31, 2018 are as follows (in thousands):
Year ending December 31, |  |
2019 |  | $ | 10,000 |
2020 |  | 11,875 |
2021 |  | 14,375 |
2022 |  | 15,000 |
2023 |  | 29,550 |
Total |  | $ | 80,800 |
The maximum amount of credit available to us under the loan agreement for revolving loans and letters of credit as of December 31, 2018 was $300 million. 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 approximately $57 thousand letters of credit outstanding as of December 31, 2018 and no of letters of credit outstanding as of December 31, 2017. 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 December 31, 2018, the LIBOR base margin was 1.75% and the base rate base margin was 0.50%. The base margins increase or decrease in increments as our Total Funded Debt/EBITDA Ratio increases or decreases. 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. We have executed compliant interest rate hedges. The amount of swapped debt outstanding as of December 31, 2018 was $50 million. After taking into account the impact of hedging instruments, as of December 31, 2018, interest rates on portions of our outstanding debt ranged from 3.00% to 6.00%, and the effective interest rate on our aggregate outstanding debt was 4.17%. Interest expense incurred on bank loan borrowings and interest rate hedges was approximately $6.9 million, $7.2 million and $7.8 million during the years ended December 31, 2018, 2017 and 2016, 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, which decreases over time, and a minimum Fixed Charge Coverage Ratio. We were in compliance with required ratios and other terms and conditions as of December 31, 2018.

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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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