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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Carrying and Estimated Fair Value of Other Financial Instruments | The following table presents the carrying amounts and estimated fair values of our other financial instruments by hierarchy level as of December 31, 2018 and 2017.
| December 31, 2018
|  |  | Hierarchy Level
| Carrying Amount |  | Level 1 |  | Level 2 |  | Level 3
Liabilities |  |  |  |  |  |  |
Acquisition-related contingent consideration, including current portion (1) | $ | 2,960 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,960 |
Long-term debt | 316,250 |  |  | — |  |  | 291,837 |  |  | — |
Total | $ | 319,210 |  |  | $ | — |  |  | $ | 291,837 |  |  | $ | 2,960 |
| December 31, 2017
|  |  | Hierarchy Level
| Carrying Amount |  | Level 1 |  | Level 2 |  | Level 3
Liabilities |  |  |  |  |  |  |
Acquisition-related contingent consideration, including current portion (1) | $ | 3,750 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,750 |
Long-term debt | 400,000 |  |  | — |  |  | 409,000 |  |  | — |
Total | $ | 403,750 |  |  | $ | — |  |  | $ | 409,000 |  |  | $ | 3,750 |
(1) | The short-term portion is included in “Accounts payable, accrued expenses and other,” and the long-term portion is included in “Other liabilities” on the Consolidated Balance Sheets.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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