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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments All Other Investments [Abstract] |
Summary of Bond Activity | The following table summarizes our bond activity for the years ended December 31, 2019 and 2018 (in thousands):
|  | 2019 |  |  | 2018 |
Fair value at January 1 |  | $ | 56,556 |  |  | $ | 51,101 |
Purchases |  |  | 27,216 |  |  |  | 18,426 |
Sales |  |  | (1,686 | ) |  |  | (1,793 | )
Maturities and calls |  |  | (22,272 | ) |  |  | (10,445 | )
Decrease in bond premium |  |  | (460 | ) |  |  | (377 | )
Fair market value adjustment |  |  | 1,305 |  |  |  | (356 | )
Fair value at December 31 |  | $ | 60,659 |  |  | $ | 56,556 |
Summary of Outstanding Interest Rate Swaps | The following table summarizes our outstanding interest rate swaps and their classification in the accompanying Consolidated Balance Sheets at December 31, 2019 and 2018 (in thousands). Refer to Note 7, Fair Value Measurements, to the accompanying consolidated financial statements for additional disclosures regarding fair value measurements.
|  | December 31, 2019
|  | Notional Amount |  |  | Fair Value |  |  | Balance Sheet Location
Interest rate swaps |  | $ | 45,000 |  |  | $ | (591 | ) |  | Other non-current liabilities
Interest rate swap |  | $ | 25,000 |  |  | $ | 66 |  |  | Other current assets
|  | December 31, 2018
|  | Notional Amount |  |  | Fair Value |  |  | Balance Sheet Location
Interest rate swaps |  | $ | 70,000 |  |  | $ | 1,096 |  |  | Other non-current assets
Summary of Effects of Interest Rate Swap | The following table summarizes the effects of the interest rate swap on our accompanying Consolidated Statements of Comprehensive Income for the years ended December 31, 2019 and 2018 (in thousands):
|  | (Loss) recognized in AOCL, net of tax |  |  | Gain reclassified from AOCL into expense |  |  |
|  | Twelve Months Ended December 31, |  |  | Twelve Months Ended December 31, |  |  | Location
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |  |  |
Interest rate swaps |  | $ | (1,222 | ) |  | $ | (17 | ) |  | $ | 399 |  |  | $ | 357 |  |  | Interest expense

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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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