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Debt | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Debt | (8) Debt Debt consisted of the following (in thousands):
|  | As of |
|  | March 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Revolving credit facility |  | $ | 50,000 |  |  | $ | 70,000 |
Term loan |  |  | 148,500 |  |  |  | 152,625 |
Less unamortized discount |  |  | (367 | ) |  |  | (399 | )
Less unamortized term loan debt issuance costs |  |  | (566 | ) |  |  | (615 | )
Less current portion of long-term debt |  |  | (16,500 | ) |  |  | (16,500 | )
Long-term debt, net, less current portion |  | $ | 181,067 |  |  | $ | 205,111 |
Principal payments on debt are due as follows (in thousands):
2018 (remaining) |  | $ | 12,375 |
2019 |  |  | 16,500 |
2020 |  |  | 20,625 |
2021 |  |  | 149,000 |
Total |  | $ | 198,500 |
The estimated fair value of the Company’s debt based on Level 2 inputs using the market approach, which is primarily based on rates at which the debt is traded among financial institutions, approximates the carrying value as of March 31, 2018 and December 31, 2017.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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