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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2021
Investments, All Other Investments [Abstract] |
Summary of Investments | The following table summarizes activities related to these investments for the six months ended June 30, 2021 and the twelve months ended December 31, 2020 (in thousands):
| Six Months Ended June 30, 2021 |  | Twelve Months Ended December 31, 2020 |
Fair value at beginning of period | $ | 25,708 |  |  | $ | 60,659 |  |
Purchases | 7,900 |  |  | 3,447 |  |
Sales | (5,550) |  |  | (22,078) |  |
Maturities and calls | (2,415) |  |  | (15,409) |  |
Change in bond premium | 591 |  |  | (857) |  |
Fair market value adjustment | (217) |  |  | (54) |  |
Fair value at end of period | $ | 26,017 |  |  | $ | 25,708 |  |
Summary of Outstanding Interest Rate Swaps | The following table summarizes our outstanding interest rate swaps and their classification in the accompanying Condensed Consolidated Balance Sheets at June 30, 2021 and December 31, 2020 (in thousands):
| June 30, 2021
| Notional Amount |  | Fair Value |  | Balance Sheet Location
Interest rate swap | $ | 20,000 |  |  | $ | (292) |  |  | Other current liability
Interest rate swaps | $ | 65,000 |  |  | $ | (859) |  |  | Other non-current liabilities
| December 31, 2020
| Notional Amount |  | Fair Value |  | Balance Sheet Location
Interest rate swap | $ | 10,000 |  |  | $ | (13) |  |  | Other current liability
Interest rate swaps | $ | 85,000 |  |  | $ | (2,552) |  |  | Other non-current liabilities
Summary of Effects of Interest Rate Swap | The following table summarizes the effects of the interest rate swaps on the accompanying Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2021 and 2020 (in thousands):
| Gain (Loss) Recognized in AOCL, net of tax |  | Loss Reclassified from AOCL into Expense |
| Three Months Ended June 30, |  | Three Months Ended June 30, |
| 2021 |  | 2020 |  | 2021 |  | 2020 |
Interest rate swaps | $ | 117 |  |  | $ | (1,007) |  |  | $ | (280) |  |  | $ | (350) |  |
| Six Months Ended June 30, |  | Six Months Ended June 30, |
| 2021 |  | 2020 |  | 2021 |  | 2020 |
Interest rate swaps | $ | 1,078 |  |  | $ | (1,660) |  |  | $ | (565) |  |  | $ | (383) |  |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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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=121590274&loc=SL5624171-113959 + Details
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